Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb20376013b4ce5…

MALICIOUS

PDF

65.3 KB Created: 2021-04-01 22:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 91060cdc8fc9b3bcc07dc9ff4477d6a6 SHA-1: 8926cef337fe08a01e6b307607125d3fee8bbf86 SHA-256: 3cb20376013b4ce5e8d4f31d6a047614196373c1730ffeeab882f13ed76feb0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=1st+grade+writing+worksheets+blank PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fc9054b34da1.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/dekijedinit.pdfIn PDF document text
    • http://store50off.info/33278887324a23zl.pdfIn PDF document text
    • http://just-gopro.com/sapiens_harari_criticismx9iri.pdfIn PDF document text
    • http://lightly.store/39672379463f860d.pdfIn PDF document text
    • http://italiahot.fun/98114613678fq92i.pdfIn PDF document text
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/946974.pdfIn PDF document text
    • http://spiritstudio.ru/918223173484f4bn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_6061dcecbeaa1.pdfIn PDF document text
    • http://salet.store/6493831896677wpw.pdfIn PDF document text
    • http://kartaidatodemeleri.com/finding_missing_angles_worksheet_answer_keyg506s.pdfIn PDF document text
    • http://everydayy.fun/advanced_excel_vba_bookdjfps.pdfIn PDF document text
    • http://suxifanivosexiw.22web.org/mojawavosemuvafirodozogiw.pdfIn PDF document text
    • http://titanovyi-filtr.ru/74077960447jc11h.pdfIn PDF document text
    • http://silvanozito.online/vobikopebadazorusununimow5n7q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakupoxefale.epizy.com/fojupodo.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c22d79cf46584d4bb58cb6eb9ceb2c9b.pdf?index=trueIn PDF document text
    • http://zopusawonomiwi.rf.gd/wixavotiwadudalopoboret.pdfIn PDF document text
    • http://kagumaxapa.rf.gd/antivirus_scanning_best_practices_guide.pdfIn PDF document text
    • http://bomofafavadu.rf.gd/zenerudoselexonuz.pdfIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_9931d6e551f04c7c92502a91d7fb2397.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 5340 bytes
SHA-256: 93e6a0dc6db8f470af16b87c5039b83e66b0bc6a3d005d1c77eeaa1599b370d3
font_01_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 9696 bytes
SHA-256: 38d86c74cb77effdd2a1a590e035b87b8db9368f0155aa153a9bc5ad22d00725

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