Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b55e8d977384b5…

MALICIOUS

PDF

68.3 KB Created: 2021-01-03 04:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a5b6562ca77e6a3ee36c33fd0f305ba7 SHA-1: 8be64a53823ed7d43bc36d55f9a488be6137d49f SHA-256: f2b55e8d977384b594204a3726da264029193adf3859b4b1abb7dec5819930fc
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, indicating malicious content. It contains a mass of external links, with one prominent URL pointing to a site that appears to be part of a link farm. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to a potentially malicious website, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/aws?utm_term=postulate+geometry+worksheet PDF link annotation
    • https://cdn.sqhk.co/gipirukanut/hid8E5O/wozefu.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/6698232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8b0f6044d49.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/cJjbih5/94050870420.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
    • https://uploads.strikinglycdn.com/files/753a1524-9246-45ad-9c0e-a9d40242bc2b/paletibuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/jejojewositulor.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/vezudilelunemoxudasiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206fcf69-25f6-4d8a-9398-7cc0bdaa52de/chase_travel_notification_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faccb433-9ef0-4486-8127-6412febb6016/chemical_equilibrium_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/latest_hollywood_animated_movies_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/apk_minecraft_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/zuxedomuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c87cb44-0488-4705-af0e-6e49f231bebb/77810835612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d593c4-7190-48aa-a044-c7c110247707/7443051765.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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 5084 bytes
SHA-256: e187e5435f7fed5e956d6f833146ad8067c773e31f9a8493d51a85dce2805155
font_01_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 9724 bytes
SHA-256: 2ae0f20475ef9ef0cc9fa55bb53f456ae5c6864dad4d6d89fe22cbb5c129257f
font_02_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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