Malicious PDF — malware analysis report

Static analysis result for SHA-256 535a1e908f685089…

MALICIOUS

PDF

72.2 KB Created: 2020-12-21 23:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 118931dcfd4051b624a013bb1984475c SHA-1: 90dea515c513b1c603a6aa40c33a0d33977de1f3 SHA-256: 535a1e908f685089c65b1735e59d7d8df7874e576dafe8bcd9d763d2eb7f1518
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=pago+facil+recarga+directv PDF link annotation
    • https://bofunakepubosux.weebly.com/uploads/1/3/4/3/134371141/pigavejokan_wibixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fc6b38f1573f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5fe03f8f44fc5.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/koguropafovug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f9291101d940.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://s3.amazonaws.com/xufujofaleki/audible_free_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/38179766416.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/pulifigulilugadaz.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/impulse_control_exercises_for_kids_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/lekidifolamivefinuse.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/5001102201.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/template_for_sale_agreement_of_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8bbd0a-480a-40a8-96c8-1a78f75afc07/minecraft_cop_servers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdbcf56-a77b-4450-95ce-a176744a378e/88315852760.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 4752 bytes
SHA-256: 45f0d2860083fe31fd19c1cb2e9ca4e6a46b4c8e229b4a1ce47baf5aaa7182b4
font_01_sfnt_off0000c164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 1860 bytes
SHA-256: 8270ec551010a237f24ce82f4ff8daf917b1a31a43e2b3c4db0b2174b3c60df8
font_02_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 11260 bytes
SHA-256: cd283ec194f6d488a68c235754d549dedf7f0224287a9b9a2644b7f2b87e4bb0
font_03_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_04_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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