Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0510dcb5aa810f…

MALICIOUS

PDF

68.2 KB Created: 2020-12-19 15:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b38f03405a63217b43fa9e4e8acd99 SHA-1: 1d9836b976d870407c671bb16152cbb59e3b21de SHA-256: da0510dcb5aa810fa0845797a4d3c7f5b95f408ae4cb4c0f0a3a63053ea50417
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate a malicious intent to redirect users to potentially harmful content.

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://traffine.ru/aws?utm_term=letter+book+template
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/7728301.pdf
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/2440469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lodunixodetum/cosco_booster_seat_instructions.pdf
    • https://s3.amazonaws.com/piwupevivotixi/bbc_news_app_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/bd44e263-9c5c-479c-81bb-0935d84a87c1/honda_rancher_350_manual_shift_conversion.pdf
    • https://uploads.strikinglycdn.com/files/f3d9458b-eb23-4891-b904-4e8f7c4e9250/taco_bell_menu_calories_mexican_pizza.pdf
    • https://s3.amazonaws.com/fajeloninesitel/mavowokiso.pdf
    • https://uploads.strikinglycdn.com/files/847dab1e-eb7c-43fe-9dd5-69fd049b6813/jomasozuxu.pdf
    • https://uploads.strikinglycdn.com/files/0ad02cce-befe-4fde-affc-b86aed5f9c03/61542223191.pdf
    • https://uploads.strikinglycdn.com/files/edd7146c-6b3c-41ac-a195-1aeb0fd65137/62618739553.pdf
    • https://uploads.strikinglycdn.com/files/46e03a80-fb84-4be1-87f6-93269c37920b/96140577088.pdf
    • https://s3.amazonaws.com/wusone/ethical_considerations_in_questionnaire_research.pdf
    • https://s3.amazonaws.com/sedowedi/accident_reporting_center_toronto.pdf
    • https://uploads.strikinglycdn.com/files/7691531b-34db-45f7-980a-286fb92a4f3d/social_problems_11th_edition.pdf
    • https://s3.amazonaws.com/nefunupu/birthday_cake_app.pdf
    • https://s3.amazonaws.com/vudivuzakal/btelinx_windows_application.pdf
    • https://s3.amazonaws.com/tajimipojimo/32579447854.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_off0000cf0e.bin
5954cb62976dd8eb3553a55c7c5b7a919679734de7ddd5e9114326a550774f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 4932 bytes
font_01_sfnt_off0000dfc1.bin
fb218cf6963d861b62c91ede60a9854f4dcc9b2d3e54d38959fa0586d0580c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10504 bytes

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