Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a9ed1e71ca94e4…

MALICIOUS

PDF

81.0 KB Created: 2021-05-14 10:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a7640bf653a39b03e7d55b98232bee5 SHA-1: 9ecebef991e88f92d0cef874eaa989cee0bdebf6 SHA-256: 85a9ed1e71ca94e4a608078fef7e4c7bbacec5542ae9abed0f6ace49982bf957
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 0.9992

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=zebra+qln220+printing+blank+labels PDF link annotation
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/2589055.pdfIn PDF document text
    • http://jopkapopka.online/affirmative_and_negative_words_in_spanish_practice1f5k0.pdfIn PDF document text
    • http://vvd.bar/motonudivulask5d.pdfIn PDF document text
    • http://natorg.fun/495310683828p3cu.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/mowabupele.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/midakosemiwi.pdfIn PDF document text
    • https://giriwegulajujup.weebly.com/uploads/1/3/4/3/134320738/cdca896b67fbf2.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/jagexoma_kiforabez.pdfIn PDF document text
    • http://bivoxuwod.iblogger.org/19515304279.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
    • http://xeleleragakiji.epizy.com/espejos_eduardo_galeano_gratis.pdfIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_544d5f90acca444491661ff290dd55b2.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_56af3c8e2d5d459aadad9a29cb2a3107.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_a7d4b784c26840369de6f1f1873f50ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/jotojopebudojavobuzisuped.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/wexugetipogimojedenu.pdfIn PDF document text
    • http://baxuset.rf.gd/workout_program_to_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/5739279184.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_43407be04977421b92029a883a4ab3a1.pdf?index=trueIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_b37a27a2e7ee4e9ebc576d0c1a067be7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tattoo_aftercare_advice_sheet.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_5d921d496e7d446aa1f709c75965bba8.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_30d96a479cc540618e21933df099b0a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/runizizulobiwefewiluvom.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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5228 bytes
SHA-256: 8eeadb9084bb4b7c51555d22ee0852a1a60333583113c4b2cc008d206eb77694
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10804 bytes
SHA-256: 4ac6ac526676cf606438cae16198a089136981d6dc283e3db27fd538f87aa9e3
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378