Malicious PDF — malware analysis report

Static analysis result for SHA-256 f555ea41df9185a2…

MALICIOUS

PDF

64.0 KB Created: 2020-11-25 09:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dd5a151cdc81971e0c2fb887dffea32d SHA-1: efbc03cc154aebac9e8bb7593b2e32286784510b SHA-256: f555ea41df9185a27358486e648167f3f42cca3178db1635342140bad5e19fdd
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://ggtraff.ru/123?utm_term=3dse+apk+bios+download In PDF document text
    • https://xelokadidato.weebly.com/uploads/1/3/3/9/133986733/d1b0faaf69ba8d2.pdfIn PDF document text
    • https://bubudatitiga.weebly.com/uploads/1/3/4/3/134308982/5520388.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/vitibigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8d0a7f4fb64.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/mowoxobakoloma.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/225cc1956.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/koxakozuwurap_mejivipov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f870c3990d2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f956e331e6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fba2c89a9c53.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/1545007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fbded4e604ac.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/zeworibuzoza/lirakizusalumumajad.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/game_asterix_and_obelix_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c115109-2286-44b6-941f-f7737dd949cd/ziretomuneribaxekeb.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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 4928 bytes
SHA-256: 6350f6420da5064e7364e90a9b7ca5a4ec24f4263ceabe30382c3ef073cd92f7
font_01_sfnt_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 11332 bytes
SHA-256: 34b1bd217c2417f029fbe49200e223e851246207fd968b581086f35ac73d004b
font_02_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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