Malicious PDF — malware analysis report

Static analysis result for SHA-256 6557b7fa41252aeb…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 15:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b71493139026174ea5c40c4feaa2296a SHA-1: 4770bd1037ff471057992f55e22cdc590b68afad SHA-256: 6557b7fa41252aeb1d118c446a1c2ce5b747c4037d04f70f9251245b0058b1b0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it may be used to redirect users to malicious websites or download further payloads, aligning with common phishing or malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=differential+amplifier+theory+pdf PDF link annotation
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/8345379.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/6367059.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/140cfe.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/accounts_payable_notes_in_sap_fico.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/funisavelip-fisodiz-kixapusorek-sapitazuveki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_6032a0b1d29c4.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/10293.pdfIn PDF document text
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/detexafesolus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_603c6e45b0f8c.pdfIn PDF document text
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/8884800.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/pobure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_603129416b86d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5fed064a0eff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_6039ea93e2bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_600db3c622703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_6025983ee965f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wavunot/how_long_do_you_cook_a_rib_roast_on_a_rotisserie.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/free_offline_audio_bible_app.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/70760347616.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/vudexosijabugeveraladixaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 4992 bytes
SHA-256: 4d5bd96cc94eaf97fd462649440631f629185691ca8dee9b2c7b9d0009074987
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 10408 bytes
SHA-256: 667af570a81168681ea296c00c346c490ed68c8dee4ede87d4496e936d784aec
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e