Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2960680163fa15…

MALICIOUS

PDF

68.5 KB Created: 2021-06-06 18:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: acefa020a523a07e1a916f14b20ab2cd SHA-1: 2ed603e3169b37ab72af0271757af4db1bc9beff SHA-256: 6b2960680163fa1550b3acbb56bc53aca7db882305e894217aba132d4b36167a
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure and a link farm hosted on disposable domains. The primary malicious URL, https://pelibifir.ru/123?utm_term=10.+3+generating+equivalent+expressions+answer+key, is embedded within the document, suggesting an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/123?utm_term=10.+3+generating+equivalent+expressions+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455673/normal_6046818253553.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413703/normal_60b5534fabe12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fcce72e421cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5ff11b5494980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_60baecb2e49f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60208b9c1ef57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_5ff95ecd58484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600dc41132817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_600da642a3b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b6469b-0cff-4cd8-ad4f-739cdb9eb03b/furatevimeki.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144712731/9655396072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d2680a-b7d5-45d1-a230-8eaaf2bca777/home_dehumidifier_not_collecting_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b70ae54-ae7a-4b76-a38a-3923263bc941/45504938249.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/phonetic_transcription_exercises_with_answers.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412410/81883983322.pdfIn PDF document text
    • http://kesowununak.pbworks.com/f/31238929771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908fbe69-dd68-428b-99e1-17adafbf0903/95914045214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4559803-376a-4bfe-94b5-6fdde240a848/36743685420.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144470358/bumedepedovaziber.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 5792 bytes
SHA-256: 6066654306fbc9f97f94266ae04b781b4927c7014764a5e7a022270af1460ac3
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 9808 bytes
SHA-256: 4d1e03641186545c272ab35997640d12ee6607c43fd6d9b281b655f40bb180e1

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