Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bde25410bc9859…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec69cbeb19dc0d3688a5e4a3d92451e0 SHA-1: b0861098794d27f19c9f7b40bfb627672f3024a1 SHA-256: 50bde25410bc9859ff68bc0799531197379fa7a3f3fa47f7ed2cb26c5fa182ea
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or SEO link farm attack designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=word+that+start+with+ge In PDF document text
    • https://cdn.sqhk.co/ragojagef/idzCf0d/cthuloide_welten_archiv.pdfIn PDF document text
    • http://teplotronic.ru/42349735487l6vr.pdfIn PDF document text
    • https://laxaxaxiw.weebly.com/uploads/1/3/4/5/134528460/99f1f6a50686.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/gejgPif/63267181774.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/pCRhchi/verloren_bestanden_terughalen_android.pdfIn PDF document text
    • http://003-center.ru/witalukumokel73gn.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/nikamof_kisunob.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/2192444.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jjfjeid/best_inside_out_movie_clips.pdfIn PDF document text
    • http://ranking-se.com/wotepepixilerurenavofeim3gw.pdfIn PDF document text
    • https://daxixulo.weebly.com/uploads/1/3/1/0/131070202/d197c9b7fbf.pdfIn PDF document text
    • http://bilet-pdd.site/wurosevesofxiigm.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/gfrXiga/fake_call_for_bendy_app.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/6735011.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Bihhbif/baby_sleep_sounds_alexa.pdfIn PDF document text
    • http://teksalon.xyz/john_deere_sabre_1438_wiring_diagramv71j6.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/zozuxukoxo/the_city_and_the_stars_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/kewetibevubuvujubej.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/32166387241.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5160 bytes
SHA-256: a3923f47213a84c9d809014d24a4f66b2e1f7355e7d3ab558ddc83c925bf73d9
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 11068 bytes
SHA-256: a9b2a2ccc72fba0f29b1ff663004c9709f5220b98eb10f46236ffa7bbab6a48a

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