Malicious PDF — malware analysis report

Static analysis result for SHA-256 6190f71ad450c907…

MALICIOUS

PDF

90.2 KB Created: 2021-04-30 01:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eac47bdedba1466856615cc40815d057 SHA-1: ec61f97524f46d80b4470c44d2e7a77d6a4f0045 SHA-256: 6190f71ad450c90730f3f731cd6017cc16bd25966344e0ef0d394eee1846da19
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external links, one of which is a UTM-tagged URL pointing to botokaw.ru. The document's structure and embedded links suggest an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=sharp+lc-65le654u+stand PDF link annotation
    • http://guronid.mygamesonline.org/learn_portuguese_portugal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_05ec6b855f0545beb41a31180686137b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0f2299-7c21-4946-8805-baa0424472e3/how_much_is_it_works_skinny_brew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cb5429-841c-465b-ac2d-612bf48925f1/12211843953.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_9cc16aa4eaf641f6a023e93b1000a1e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/581587dd-8f76-4eaf-8f47-166cc1970282/surah_yasin_full_text_in_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/63239185821.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_adb529d00bde414e856685d6869689ac.pdf?index=trueIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_a146697033de48c9bcdbf15b9338fbd2.pdf?index=trueIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_b1cc9032cea8468a979bb409323994e4.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_4aa4bb43b5114471b8e2bf4b50d51c0b.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/how_to_get_procreate_for_free_on_ipad_2.pdfIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_3546e77d0a8f47e6969546f1110dbbfd.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_13577513a6f34d6f8c23c0f8aa62dd8a.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_06106d4dc8ec417bac86ef48163d4560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/sapamuzofejafirumowob.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_b1f6b68305dc493791db01e33bb377eb.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/46730858216.pdfIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_bd7d00929c6a4f8f8343d2977ee12e7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d539bb2c-6ee4-4a12-826d-acb3f75f5698/zigiwiduwuvuxaw.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_22d25eaa2a1d499b958da98db2a42338.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_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 5664 bytes
SHA-256: 2a4b4b7cfb2d39a428db386e9a27b237509b01d1bc5b9512eef129cd541fcac7
font_02_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 11560 bytes
SHA-256: f822e04f9fbc2f12c8dbaf163d333f5bea5580a97ea0ec97b5b3d46cb19369fd
font_03_sfnt_off0001456a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c