Malicious PDF — malware analysis report

Static analysis result for SHA-256 003846e5821e2540…

MALICIOUS

PDF

74.4 KB Created: 2021-03-29 03:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406d479f09ca5b989eb85f1394c6011b SHA-1: 9304f6a9d30c278937c49783ddccb29d1b0c2927 SHA-256: 003846e5821e25408ac716279be1dd75a9f7a65957ece25b4ba7a815b7d8deaa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, including a link farm heuristic, suggesting an attempt to redirect users to malicious sites. The embedded URL and the heuristic for a link farm point towards a phishing attack, likely delivered as a spearphishing attachment.

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://golowaki.ru/123?utm_term=math+worksheets+grade+3+rounding+off
    • http://xapiduxirob.mywebcommunity.org/93487482259.pdf
    • https://pamimimafe.weebly.com/uploads/1/3/0/7/130775080/db8149.pdf
    • https://suzazenesegi.weebly.com/uploads/1/3/0/7/130776168/3930374.pdf
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5ff7f1906642d.pdf
    • http://posebakuxosafod.getenjoyment.net/sewodagofezuvusinufe.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/doxasapapifukosewipa.pdf
    • https://static.s123-cdn-static.com/uploads/4479460/normal_6002246baf837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_63b43708a6324a23b0001ebe8a3f7d0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e8c4da2-3041-4370-9837-43de14569d40/xugag.pdf
    • https://uploads.strikinglycdn.com/files/5baa252e-cea1-4063-b86d-e7c01c03759d/joy_to_the_world_lyrics_and_chords_key_of_c.pdf
    • https://uploads.strikinglycdn.com/files/0c131079-c772-48f0-b168-ce8aceee36df/12595683532.pdf
    • https://uploads.strikinglycdn.com/files/3b5c4582-9cda-49ca-b57a-435c066903ff/personal_pronouns_quiz_for_grade_3.pdf
    • https://uploads.strikinglycdn.com/files/3931326c-498a-4914-9cf6-02dad7cab7b7/introduction_to_computers_class_3.pdf
    • https://uploads.strikinglycdn.com/files/290407ab-bc59-4d85-ab0a-748a24d258c0/quote_with_friends_like_these_who_needs_enemies.pdf
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_1db75ad94f65450bbbb1a5cb5199b93a.pdf?index=true
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_8c7f8c6dd36340d8b1672135bd24fd05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aceff81c-e371-4dc9-9719-23a75642d42d/does_the_roomba_675_have_mapping.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_off0000e5fb.bin
8d2dfb82aa18cc48a5b33dde1e583c48cebfc51ce3c9065968f6bd8f5d7953c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5464 bytes
font_01_sfnt_off0000f8aa.bin
2e8a9d26a74e383767faa3bcc66c40e510f847145400d53ed88bddc1b8b85c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10508 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.