Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8447734f4266b6…

MALICIOUS

PDF

70.4 KB Created: 2021-02-20 07:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c56cc45d34831395d50020c91c782e7 SHA-1: 254609296e64ebd99286c5a7bfbbc6eb3467ca24 SHA-256: 8a8447734f4266b6d529692b5d4e0493f3d012265a65680d6e1baf712f98d3a3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=star+citizen+lorville+map PDF link annotation
    • https://daxokubazab.weebly.com/uploads/1/3/1/4/131406800/6683428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_600eb4a8dbd2e.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/lurafegelu_vinolusar.pdfIn PDF document text
    • http://trylait.club/zerafutonoqbm1.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/524tMTY/zarowe.pdfIn PDF document text
    • http://lovelyhouse.online/5563524114x212u.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/bc62b464f23.pdfIn PDF document text
    • http://idealica-columbia.site/zemikanuxaflocfm.pdfIn PDF document text
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/9a881d02206.pdfIn PDF document text
    • https://cdn.sqhk.co/kurapobal/tijfkij/sniper_strike_shoot_killer_unlimited_money.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/xiwuzavig.pdfIn PDF document text
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/dugugalejepe.pdfIn PDF document text
    • http://zafimapi.22web.org/dedication_sample_for_ojt_narrative_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5feba2b598bfb.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/5212524.pdfIn PDF document text
    • http://hotel-engels.ru/garrett_hardin_tragedy_ofthe_commonsqkk9h.pdfIn PDF document text
    • http://legendarycraft.ru/biology_word_meaning8vxy8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ff6a208d3fee.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/hioShSr/mepigosokajix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipariwemarisu.rf.gd/chevy_truck_parts_manual.pdfIn PDF document text
    • http://gagonunanu.epizy.com/39926051668.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/49708078247.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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 5116 bytes
SHA-256: 8f28e797d3be20863c34e806211816f62bac5fbade360884a0d8d326ce899056
font_01_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 10116 bytes
SHA-256: 3f82c02b1b3a9fe1f69303b061420b2faa0f8d3ea4df62d8bcd51131fbf6ae47