Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72ca5179c5d7ffd…

MALICIOUS

PDF

77.2 KB Created: 2021-01-19 19:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ebd13b8980ba3f76f098ea1a8e86653 SHA-1: 9d90a822987df3a84c4ea1ae7ff6a9c6c7657254 SHA-256: f72ca5179c5d7ffdbb14cba9cbfcec9ef74328810035e700967b8acea6bc1139
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, forming a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. The presence of numerous external URIs points towards a content-driven attack.

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
  • 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://bologen.ru/aws?utm_term=genomic+dna+phenol+chloroform+extraction PDF link annotation
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/4265606.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/34b02dd9a6603.pdfIn PDF document text
    • https://site-1175626.mozfiles.com/files/1175626/lisuwasowoxubetameso.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/xMDibjg/likedudiposevexuka.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/18783.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/hhahgid/bright_morogoro_mp4_download.pdfIn PDF document text
    • https://site-1174582.mozfiles.com/files/1174582/sibele.pdfIn PDF document text
    • https://site-1177924.mozfiles.com/files/1177924/68867060385.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/zenarodoworopowi.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/ninez-fafifotam.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/ceQicie/war_dragons_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gjijhcY/64806064915.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hhihidc/jikoluvipadiganagepov.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/jhhcxjf/jupitikuro.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/1745854.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/IRgi1ig/tigedujozanevanotazu.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/Yhjha91/faith_family_freedom_fund.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/xezefejazibesa-radezixibum-nukufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/mile_run_time_average.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/33020482604.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_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5316 bytes
SHA-256: edb7209997b6da71202742be6465cce4189fe65f4fd5962d71c1ec5b2b9f9bd7
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10520 bytes
SHA-256: 5eca908de8063961561fa2313621c3e13695ed5cd28b1d88d8852e98a90d7a7f