Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f0611957ce5f17…

MALICIOUS

PDF

92.2 KB Created: 2021-04-06 08:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 44760b202ad9c141db34291139c90381 SHA-1: 25e89e643681dc433dcc086199f3b7211c96773f SHA-256: 44f0611957ce5f17ba2028020646162b2edc261b280bf95535f6f7eca52022e7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=the+twilight+saga+breaking+dawn+part+2+cast+irina PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fedca096c745.pdfIn PDF document text
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/xixelo.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/fuzinekoj.pdfIn PDF document text
    • http://cheatyou.site/141274377086bd1b.pdfIn PDF document text
    • http://e-sparks.ru/38395961645zcah4.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/wotarod.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/5748318.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/parallel_circuit_problems_worksheet_answer_key3xf5b.pdfIn PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/cff6be.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/appsc_group_2_previous_papers_with_answers_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf92ac42204.pdfIn PDF document text
    • http://flash-sar.online/lomononefakuzivodybuun.pdfIn PDF document text
    • http://svoytrylend.xyz/mikumudefustsci.pdfIn PDF document text
    • http://myfavoritesun.xyz/5945783627827ots.pdfIn PDF document text
    • http://wisecredit.info/operations_research_graduate_degree_programs0a319.pdfIn PDF document text
    • http://baltika-trans.ru/baby_girl_names_2021_biblicalntjg2.pdfIn PDF document text
    • http://xegisepereti.mygamesonline.org/73575111389.pdfIn PDF document text
    • http://test123test.xyz/hungarian_verb_conjugation_practice3zyih.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 5712 bytes
SHA-256: 61dcea1f4e43c5142269f3bd9988bf0f9b0cd6a6135916ba5adc96bfa1d9f5e7
font_01_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 12092 bytes
SHA-256: 341e1e3e5a0b1c7858238e310806bb59cbdb002e955e59c61e5562c2cbe2ef4f

Open this report in the interactive analyzer, or submit your own file for analysis.