Malicious PDF — malware analysis report

Static analysis result for SHA-256 554682e15ddf4278…

MALICIOUS

PDF

65.7 KB Created: 2021-03-23 04:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed5a999ab1b4dd955c296139588fe53 SHA-1: 6a97ee3ccb7d2e136c19685ab4a9077c367b632e SHA-256: 554682e15ddf427871947be66a115b9146a27bcd119522d67366087e44646896
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, suggesting it might be part of a larger automated process for creating malicious documents. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=drinking+from+a+fire+hose+image
    • http://lnstagramverifiedsbadgeforms.com/vuvuzizufajeranaselesearrqg.pdf
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/vewumozerokijerud.pdf
    • https://cdn.sqhk.co/bevizewo/Yjibpia/22381588265.pdf
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/jogurebakoturat_sewajoniwigolun.pdf
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/9383458.pdf
    • https://cdn.sqhk.co/xibidodoko/idNnG8z/11530504272.pdf
    • https://sebidodeg.weebly.com/uploads/1/3/4/4/134438526/rudaxuxanuzoto.pdf
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/birutupega.pdf
    • http://proita.space/malaluwidn65zl.pdf
    • https://cdn.sqhk.co/gemadaruvow/qDfjbff/54162552916.pdf
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/zonefew_fuzomekawe_mugizudu_wofivasopadexid.pdf
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/8315435.pdf
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/3349421.pdf
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/4206311.pdf
    • http://kleomaften.online/wapiwuseletifuwunegalapalrte.pdf
    • https://cdn.sqhk.co/tevotapomow/Vibhgl7/68539101218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_ebfa5503da3b44758a9ac342180513a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/055ecd7f-a452-4877-852f-2ab22a348fb7/ping_pong_rules_does_the_ball_have_to_bounce.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_8555e0b5cb2447c5926bc5da1d439f18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9648131-c5ab-43ee-984b-6b8f82e8e659/how_long_are_all_7_harry_potter_movies_together.pdf
    • https://uploads.strikinglycdn.com/files/e44e557a-db2a-4e2b-8bf1-6803ad9f8290/9369208807.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_off0000c56c.bin
9b71077486b54c4150b96bc7eec6c39f246b22fa96890305319b4f24d2aba696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 5212 bytes
font_01_sfnt_off0000d708.bin
5a50624a13a0ea3ccbf52418b977d22b58de53f701aa03d9dda8207fa75d056e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 10080 bytes

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