Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aeeb2e45e2c3c1…

MALICIOUS

PDF

127.4 KB Created: 2020-11-23 20:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838976222da71aca4d9936bb94e6a93b SHA-1: 5ca2bcbd635bdfa5c3766474b7a3af4960443aaf SHA-256: 21aeeb2e45e2c3c12e764fe76e18b4c9f56d505fa01af7a6696c1f044c7bd107
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and ML classification flagging it as malicious. The presence of 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_MFA_LURE' heuristics strongly suggests a phishing or credential harvesting attempt. The embedded URL points to a suspicious domain, and while ClamAV detected it as 'Pdf.Phishing.Trojan', no specific script was extracted to detail its execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/123?utm_term=raspberry+pi+3+dstar
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/1425260.pdf
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/tedurenuvebex-paduduwotejolem-wizujexar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vovabagubajegeb/50163067529.pdf
    • https://s3.amazonaws.com/davawina/6733543720.pdf
    • https://uploads.strikinglycdn.com/files/244ca35c-eb20-43e1-aa69-60bf7dcc5f89/jipumewipibemefilifido.pdf
    • https://uploads.strikinglycdn.com/files/08e259a7-70a9-48fa-868a-06f3617e57bb/smackdown_here_comes_the_pain_iso.pdf
    • https://s3.amazonaws.com/roxawo/accrued_liabilities_payable_balance_sheet.pdf
    • https://s3.amazonaws.com/xabalaru/honda_eu2000i_generator_parts_manual.pdf
    • https://s3.amazonaws.com/gelawiweza/85460262462.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018971.bin
2842ee1815d669b530308a9c084866656e29ca16818966741268fe93aa1fd44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18971 4908 bytes
font_01_sfnt_off00019a28.bin
efe38f658ea316c73b8e19fe820275d7d0ce2c845aa47865abbe4e7fee2bb50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A28 1616 bytes
font_02_sfnt_off0001a263.bin
a6e049401aaded86ac16954a42e6041ec37fffb63e48136603dae5fa89ef61b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A263 11776 bytes
font_03_sfnt_off0001cae0.bin
5d1244c97561a25c12fe38010e98e7dd67df96878cd4b93a41210c3689b78041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE0 16284 bytes
font_04_sfnt_off0001e063.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E063 4324 bytes

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