Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a75eff5675855d…

MALICIOUS

PDF

94.5 KB Created: 2021-02-23 15:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 23ae737f7f716713b4bf40a5620e661f SHA-1: b29ff37ac482be1fc114d598f7a5e5f1fb91718e SHA-256: 09a75eff5675855de2469e89aa67c8bce5db96d88dcc1ac8f7473300215e203a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a significant portion pointing to disposable domains and acting as a link farm, indicating a probable attempt to redirect users to malicious sites. The presence of external URIs and the 'disposable link farm' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=how+to+use+knitting+blocking+mats PDF link annotation
    • http://samettemiz.xyz/nalupukexexujiliuwjj3.pdfIn PDF document text
    • http://freshmind.net/how_long_to_read_dr_jekyll_and_mr_hydenjdk5.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/1528849.pdfIn PDF document text
    • http://samoe-samaya.ru/avast_antivirus_with_lifetime_keyc673e.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/4ccbe26.pdfIn PDF document text
    • http://flowerport.shop/existing_conditions_report_constructionc92i1.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/c18ea6969d3f1a.pdfIn PDF document text
    • http://on24-system.club/34570118595ygjjx.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ijhhihj/did_ryan_reynolds_play_in_ninja_turtles.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/1602512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekitizufexuwo.rf.gd/baseball_9_mod_apk_unlimited_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/72352747854.pdfIn PDF document text
    • http://rarobijeriv.rf.gd/4068191468.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/havering_sixth_form_course_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/rekenilisukuguwiw.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/zolumudajozoxivotulevenav.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_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 5280 bytes
SHA-256: f536dd15d7b4537a92f097d8fc4b56560bfb4d08cbe6a761f0be129d597b71a9
font_01_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 10568 bytes
SHA-256: e7f22b33731386fd1451aad052bd7084ef7e923231591c8bd41829dee29175b4

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