Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acff0fd87bd232e…

MALICIOUS

PDF

69.6 KB Created: 2020-12-23 08:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e9617e36a7ed5b49121767dd291d93 SHA-1: d6b275791821c8140396f8cce420e5706e7ef845 SHA-256: 7acff0fd87bd232e6a1c3f17e21f3801cc2e4e65dd793d37772a4538621e4554
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, contains text related to 'learn html programming pdf', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?utm_term=learn+html+programming+pdf
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fb9e0de98d54.pdf
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/fefa07f4e.pdf
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/1997699.pdf
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/23fd9ca3.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/e7ffeebdd3597.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/ruwupadegexab-ralak-vazazidorolos-fomuxifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/777ce036-5ee4-46b7-8773-b25a99db9c69/68100683995.pdf
    • https://uploads.strikinglycdn.com/files/3c9e34af-a33f-4305-9a8f-c7c048177833/proform_xp_treadmill_manual.pdf
    • https://uploads.strikinglycdn.com/files/cdf7e44e-3b0b-4815-bc96-540afd96b5fb/tejegitijenoninelaxipeze.pdf
    • https://s3.amazonaws.com/xisefowu/xpress_redi_set_go_cooker_manual.pdf
    • https://uploads.strikinglycdn.com/files/140af061-9fa1-438a-a98d-50f86dd792c0/61521301777.pdf
    • https://uploads.strikinglycdn.com/files/8efd2b4f-2e6d-4a67-8029-cbc9cabff7a8/kadelajurafamimuganeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8dd.bin
e417e82a9abdb3d60c82092ab55731a8f83972fbeed1d4fe2abc7d901715c9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 5004 bytes
font_01_sfnt_off0000d9ac.bin
f89125f0c6136817760ccd0cfe678d72c87a23ecb00fc8dc0cc52828a7914645		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 9976 bytes
font_02_sfnt_off0000fbb9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 4324 bytes

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