Malicious PDF — malware analysis report

Static analysis result for SHA-256 d055afc9486d4d73…

MALICIOUS

PDF

69.5 KB Created: 2021-01-12 12:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: baf90580348eeea4a297ec68076f40a0 SHA-1: 58ad7b9ef5bfc91c244ad1ff8ba97e2ef69afd6f SHA-256: d055afc9486d4d73243afd9464fb131aac341bdb7e45ddff4ff0f995a552bd08
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, many pointing to disposable hosting or known redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites for credential harvesting or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=angle+of+elevation+and+depression+worksheet+precalculus In PDF document text
    • https://site-1168030.mozfiles.com/files/1168030/pokemon_trainer_club_unable_to_authenticate_android.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/pezowane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_5fdc0db89088e.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/5148950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff3fd42ae2d5.pdfIn PDF document text
    • https://site-1174676.mozfiles.com/files/1174676/dunk_hoop_best_score.pdfIn PDF document text
    • https://mirexoxufi.weebly.com/uploads/1/3/0/9/130969656/3518804.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/tovexaj-zimibesikesu-sulerujesomi-biboni.pdfIn PDF document text
    • https://jedebesoza.weebly.com/uploads/1/3/4/7/134739829/2694aabae40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe694be7f5cc.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/cebb379eaa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456712/normal_5fccdffed6fab.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/bokofapig/canon_lide_120_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/74426393271.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/36789297050.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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 5620 bytes
SHA-256: a6737308e3d9d4d7917b9cf500def7921e7b79e58efeb8891925e6aa640e7e18
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10592 bytes
SHA-256: a4730d45375caf7c43d17ef15e6494a2976fb13fce13d7266e074467dd9a3be7

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