Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1004aba290600d4…

MALICIOUS

PDF

71.4 KB Created: 2021-02-21 19:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 033792ff25078fe7ccd3d8c3fa32c094 SHA-1: a0af13245418dd68449ae154a881073374d23f4d SHA-256: f1004aba290600d4cca2ee00ff9e6efdb209b2b970bf96081353f70bbd8bfb2b
244 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its extensive use of link farms pointing to potentially malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure, and the embedded links are designed to redirect users to external sites. The heuristic firings indicate a deliberate attempt to create a link farm on disposable hosting, likely for SEO manipulation or to host further malicious content.

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
  • 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://yafferge.ru/123?utm_term=how+to+tune+up+a+oil+boiler In PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/pifenin_xavikamobija.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/7e2c67a4d6e0.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/8300043.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/e9db27c339837b.pdfIn PDF document text
    • http://fuvafutiku.22web.org/how_to_become_a_production_engineer.pdfIn PDF document text
    • http://kaguveka.22web.org/lorijusexatu.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/femomeziku.pdfIn PDF document text
    • http://mufapalufupezas.iblogger.org/siditanud.pdfIn PDF document text
    • http://ragukir.iblogger.org/free_piano_sheet_music_pop_music.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/3469331.pdfIn PDF document text
    • http://vulefuxudonad.22web.org/video_bhojpuri_gana_gam_wala.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/ehfbkge/mobile_legends_bang_bang_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memajale.epizy.com/21637465358.pdfIn PDF document text
    • http://toxezapa.rf.gd/cfa_level_2_registration_deadline_2021.pdfIn PDF document text
    • http://lobusiwogix.rf.gd/57451454027.pdfIn PDF document text
    • http://tiworetaganufo.epizy.com/4245235663.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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 4828 bytes
SHA-256: 3da82b53ea7d8141c56cb8c409eac5fd3441dfd04e2f83e1fef0f8c5aaff157c
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 11128 bytes
SHA-256: 9695d6b74d04f693073b54b5889b1368974d2317c17d35ba75a21ee23f48d4ff

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