Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77b48e18c90768f…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 23:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe191c25d818b992ba9379fa0ddde3f2 SHA-1: 67615f369ca39ae6638d2124df600553e52d8740 SHA-256: d77b48e18c90768f432b7685f146e1fac75fe544fe88eb837ea3bd6e30ed567b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous external links, indicative of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pretext, where the user is prompted to call a fraudulent number. The presence of multiple suspicious URLs, including those hosted on 'sqhk.co' and 'weebly.com', further supports a malicious intent to direct users to potentially harmful content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=thomas+schoenberger+cicada
    • https://cdn.sqhk.co/xojurolaruk/dYXfgiJ/putanimizijafik.pdf
    • https://cdn.sqhk.co/pajokiman/hjhmgiR/brick_buster_game_for_money.pdf
    • https://cdn.sqhk.co/lobinazema/hRbZF8v/2945490257.pdf
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/levomikaxekez.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/7375df2ab76eeca.pdf
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/e23a6165ce986d4.pdf
    • https://cdn.sqhk.co/wimedizi/ww7gghd/wudedavaxopizem.pdf
    • https://cdn.sqhk.co/vujejanar/gjjfSzq/looper_auction_app.pdf
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/389064.pdf
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/8440306.pdf
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff3938078522.pdf
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/649881.pdf
    • https://cdn.sqhk.co/surofowudula/8hbIiey/pexemekur.pdf
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5fe249935fb3a.pdf
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/2042857.pdf
    • https://cdn.sqhk.co/gikunixa/gi2Oukr/1740954397.pdf
    • https://static.s123-cdn-static.com/uploads/4370561/normal_5ffaa81c18b16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin
539311e1ac618e7506c2aefc1c429d15e968de52c17410d523106309b7e7ba88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 5408 bytes
font_01_sfnt_off0000efbe.bin
89a7030675746851d757edaea2f4be549b7ba9cae222db3a528d4c076db4f9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10184 bytes

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