Malicious PDF — malware analysis report

Static analysis result for SHA-256 44490c7ea37e4ab9…

MALICIOUS

PDF

75.8 KB Created: 2021-05-26 05:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a44d741fc59ed5ec1e76c76ddd46fbef SHA-1: 723873476f037dc1c328fdc73afbc8f226695461 SHA-256: 44490c7ea37e4ab9cb4afac139a7714d6259b95c83188474385b2c2c689f363b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://jumiwimov.ru/strik?utm_term=ema+variation+classification+guidelines, is likely the intended destination for the user, possibly to download further malware or harvest credentials. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=ema+variation+classification+guidelines
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/fodabovepil.pdf
    • https://cdn-cms.f-static.net/uploads/4379477/normal_6017cf6b5d65d.pdf
    • https://cdn-cms.f-static.net/uploads/4452837/normal_6028297bbf55d.pdf
    • https://cdn-cms.f-static.net/uploads/4404490/normal_602784bca9057.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/begalo-rivurirozo-nalet.pdf
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/5220165.pdf
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5ff4f068d9855.pdf
    • https://jowuxedajaris.weebly.com/uploads/1/3/4/7/134716551/31326d9.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/064ccf27.pdf
    • https://vewisegi.weebly.com/uploads/1/3/4/4/134434396/xiwibomunasaw.pdf
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/tikuwametetik_ximigovu_mijekarafil.pdf
    • https://cdn-cms.f-static.net/uploads/4465400/normal_601a2a0b42b1a.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_606283d4cbe73.pdf
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fcbcce66bea0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remeranexe/60318424405.pdf
    • https://s3.amazonaws.com/jefazaxal/13978569124.pdf
    • https://uploads.strikinglycdn.com/files/e4fa9ce6-ff07-4623-b3d6-af94171574c6/lg_model_lfx31925st_parts.pdf
    • https://s3.amazonaws.com/libowebujakux/woxag.pdf
    • https://uploads.strikinglycdn.com/files/6b3bf1e0-cfeb-4c46-9ed1-bbe01b1ea9e2/42062507686.pdf
    • 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_off0000ebf4.bin
820ec04862f340f31a33362578f397f7588701e54e5147c5255f1dc07e716701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 5360 bytes
font_01_sfnt_off0000fe1b.bin
91950f37d9b508d045abfa7a56eeaa625f6447abd98da7b8521afa54ca0c9ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10632 bytes

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