Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5185a9bb2b3ee67…

MALICIOUS

PDF

95.4 KB Created: 2021-04-14 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5875c5f283c0b6c73131efdc42a3fd39 SHA-1: b406e6dc7e1f43909fde1b2e6312d069ea8c75cc SHA-256: b5185a9bb2b3ee673a2a335dbd72b5e95ffaafb596ff4ad9a1c882220020487e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://botokaw.ru/strik?utm_term=how+much+is+starcraft+remastered', appears to be a lure to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=how+much+is+starcraft+remastered PDF link annotation
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/soserixaba-virudafuzudifo-weratisujano.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/sosasegimizob.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/zewapevumafuve.pdfIn PDF document text
    • https://kivifakan.weebly.com/uploads/1/3/4/8/134870172/vafalevu.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/jahc7hb/select_sheets_in_google_docs.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/Gdijjdr/girezatelaner.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/jeIIhe3/12244426640.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/zafijulatasower_vidovu_suvupas_bekezowedamef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a5e3bb0d6dfe485091cd097b7b60ae43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/brother_mfc_7360n_replace_drum_reset.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_8dce940f51f24361a7da2c498712e032.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_53237c27cd6046a690ccc2a34fc6ee2b.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_1bfa09eff1ea402ebbb4e6163412f0d6.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_9843e1c656f94549a36260b5c63108c5.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_7112c816a33c4ecb82d2d0db62283236.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_8cc722bed2884ffca605cf49094ad41f.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_b3f416fcda2945d08932df9dd4c194a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/26342748333.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/82365289273.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_92029fd8d8394b268b8813c1abf38d98.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_0442be8670bc45549160dac078bde24c.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e941c111bbbc423bb5614992d412deff.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_34d20f97dede4ceab47d8f7ee39bac54.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 5056 bytes
SHA-256: a457598563d54922e88520ff8953cc5dd84b4c80ba47efc725755c4bd907da00
font_01_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 11232 bytes
SHA-256: 2d8adc50a58343142fae29f52cf404ca24645017fe5af86c6b447843133bb148
font_02_sfnt_off00014b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B39 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off00015fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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