Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2dc9c297eb6ad4…

MALICIOUS

PDF

66.3 KB Created: 2021-02-16 13:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 96cd2530ef3b19ebf5a37741da60a226 SHA-1: 26430868f656d83063f17ee134ec0738faec75a8 SHA-256: 4b2dc9c297eb6ad4e98023c0b3faa0025040ad1e50715defdc6d968b808ac0f8
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains or known redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://yafferge.ru/wb?keyword=mamiya%20rb67%20pro%20sd%20for%20sale In PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/2485206.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/d0hKxDZ/12680610971.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/kjedjfT/average_premium_for_high_deductible_health_insurance.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/5021366.pdfIn PDF document text
    • http://clientesdkb.com/mahwah_public_schools_salary_guidedbl8v.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/QihHGxY/gomig.pdfIn PDF document text
    • http://zaxunux.iblogger.org/99772468630.pdfIn PDF document text
    • http://zuzitijimopa.22web.org/taunton_tomorrow_weather_report.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/jcjhjjD/namazagizapiruvibagu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/jSiipeY/4_pictures_1_word_game.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/5861076.pdfIn PDF document text
    • http://wesaremujoworu.22web.org/coreldraw_x6_portable.pdfIn PDF document text
    • https://defupodanujazi.weebly.com/uploads/1/3/5/3/135346118/lazufen.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/1958042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitasoginit.rf.gd/88648245946.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/zogufudobujigizak.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/provisional_admission_letter_format.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 5668 bytes
SHA-256: 188b1a358fe80ef322f39097e8dd84201c3afcbfa1262e129364982bd2cc0924
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 10492 bytes
SHA-256: d5574a49fe290b5962dfa585a77ab27a3ace55f95c8390fedaf1d6268af6076b

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