Malicious PDF — malware analysis report

Static analysis result for SHA-256 82995a9873c0ece9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 16:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e927f45d81b591305f95eec776afbbbc SHA-1: b943f9d4760ee1489ee2471f1df7c41b2f94a95a SHA-256: 82995a9873c0ece93475298792bb6aeaebb4a04ffd4f65b6ba225687ac61539b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=lesson+10-1+developing+formulas+for+triangles+and+quadrilaterals PDF link annotation
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/7392130.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/puribinibi.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/2695936.pdfIn PDF document text
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/vikikawavuwedulu.pdfIn PDF document text
    • https://fupegaketivira.weebly.com/uploads/1/3/4/8/134887529/tatulales-fekuxemawini-zawigi-motonifitulaw.pdfIn PDF document text
    • http://trokot-roznica.xyz/xusozaliguxipuregewadotejre8u.pdfIn PDF document text
    • https://zobimodajozo.weebly.com/uploads/1/3/4/3/134340865/e70be.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/47ac0e501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_600deb4f348cf.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/1186489.pdfIn PDF document text
    • http://reflectionss.space/defegosinetilowipizijuzoc76km.pdfIn PDF document text
    • http://speak4pro.com/angry_birds_2_games_for_androidpxijp.pdfIn PDF document text
    • http://zyzycheat8.xyz/how_to_fix_an_ice_maker_frigidaire2kw2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5fc8ea6972e2c.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/3109852.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/mupejuwatefubolejek.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/tigemo_loludawiwixowuw.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/79ecc041e834.pdfIn PDF document text
    • http://taptopbot.com/bangor_zero_sort_recyclingsuc8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fd1238820290.pdfIn PDF document text
    • https://mewifebobonopad.weebly.com/uploads/1/3/4/6/134625165/d6eb3dc.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://s3.amazonaws.com/vovabagubajegeb/tikikulivebake.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/tuzijof.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5596 bytes
SHA-256: c7ba905d594b00b0c9209d7ec72fe737a0032c7f870c001865843302fe8b9f87
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 10400 bytes
SHA-256: afedc3e5597d890b896798bc2246b78aa8d2de236ee3611ed98e0fb2017c58b9
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2