Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3188078a6a0800f…

MALICIOUS

PDF

73.3 KB Created: 2020-12-27 00:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 115a0689a150c879d63568349caffb8f SHA-1: 1138c96c4596d5088cc42a786921db9465bf7fd3 SHA-256: b3188078a6a0800f08b11885dc5d2ff171d6864eb4691aea2cc0cb147f8029df
186 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. 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.
  • 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.
  • 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://trafftec.ru/strik?utm_term=create+list+in+excel+from+different+sheet PDF link annotation
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/16968a29a7d.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/6c7d3b01c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/CfifjbH/69201904963.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/pisadena.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/kjgcid7/lixefoz.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/zopifoxeke-sorepopunilosiz-vumapetewi-vedonewogofako.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/0f3547f6297773a.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/11c8394c7.pdfIn PDF document text
    • https://vazujupipizake.weebly.com/uploads/1/3/4/7/134719511/459bfd9690.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://uploads.strikinglycdn.com/files/365c8ad3-59d8-442c-a58b-a62e27c551d7/44634399039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c50c6ba-b692-4a68-bc67-9038a2ac6af0/pathfinder_time_stutter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c146b0a0-c9ea-45d3-93ff-b53dee9c8b37/gonezadawibidimuvupadif.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 5140 bytes
SHA-256: 4b845660c4ad84d1d0a8fff162e862673408087886651617a88cb1d982d5c726
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 11280 bytes
SHA-256: 0b3542e5315ee8b96a66897b07cc8b1592b378f59a7d6d392ab98ccab18e00c1
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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