Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca814fe5672fc8f…

MALICIOUS

PDF

71.4 KB Created: 2021-01-17 10:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b8f3fe3319c550f6d721382a0803a8e8 SHA-1: f636a31305016a03a43dccae1a23c6db76f1ff9e SHA-256: 9ca814fe5672fc8f78ebf5ec45b60d995b1f39f1d6305d91f4a2b2342a1a6536
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. The embedded content, though heavily obfuscated, suggests the document's purpose is to lure users to these external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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=blacksmithing+basics+for+the+homestead+pdf In PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/f946f37ca9.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/7728425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448992/normal_5fefc0dbb3174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_5fe33d58d5046.pdfIn PDF document text
    • https://paraminukus.weebly.com/uploads/1/3/4/7/134705680/raxirer-diliwuralen.pdfIn PDF document text
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/xukiwoladewilenoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5fe89038dec27.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/ludepupekakafe.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ghheYic/mavixeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fad112f1527c.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/chhfn60/30200111704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_6001ec0e54b72.pdfIn PDF document text
    • https://cdn.sqhk.co/roxigeve/Jhcgdhe/hockey_stick_keychain_bottle_opener.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/gaR9Chh/birth_certificate_akron_ohio_address.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevoxefi.epizy.com/wadopagibemovowajopib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 5820 bytes
SHA-256: 774a92843e9365e94190dfdaf0b93716a400c88abe5ed322e317d447683e06be
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10312 bytes
SHA-256: dcde4ee079ae6dfee1be988b7a521f2d0c53b405646eddf1474df633c318503a

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