Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b71154abdc50741…

MALICIOUS

PDF

83.7 KB Created: 2021-04-02 12:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f401229d43dc7e49cde4789da370316 SHA-1: b0324d027a9df4e83320263a95001b9cb804eec2 SHA-256: 5b71154abdc5074141c59ec9103aa19d6e38342bd375f8f906502ae35584e4ab
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and using UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for phishing or to download further payloads.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=tesda+forklift+training+requirements PDF link annotation
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/lalevof-mumovizix-pesugopi.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/5780782.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/gcNhiid/shoulder_dystocia_nice_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/cidGhix/96623707884.pdfIn PDF document text
    • https://pujuxuzanebov.weebly.com/uploads/1/3/5/3/135351243/fba9ebbc.pdfIn PDF document text
    • http://omshop.space/errterung_schreiben_bung8wb6r.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/opihics/sanic_meme_song_roblox_id.pdfIn PDF document text
    • http://romeoplanet.club/how_to_be_gratitude8tqoc.pdfIn PDF document text
    • http://reduslim-official.website/bitten_season_3_episode_13aauq.pdfIn PDF document text
    • http://bloomwithdeanna.com/bososipatixelukubevaroifry.pdfIn PDF document text
    • http://osmosiotzs.fun/cuanto_tiene_un_metro_en_pulgadas4naxk.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/hjGBhjK/94531976847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_8db36214cc9545288091e835e194dcfd.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_1093d461610241408ffeadacedb2f520.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_704cd062ec4b45c5b92c0912286ecfb1.pdf?index=trueIn PDF document text
    • https://dc6d6743-1708-4933-94ae-b59f0f1ca4f1.filesusr.com/ugd/c345b0_ef732a076d56447f842ab56e2dbbc5ab.pdf?index=trueIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_c67ca2602429470a839e81b631395d37.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 5368 bytes
SHA-256: b1d9bad063fe773eefc006cf10f1918b58fec1b6480f3160d1fb549bef9800db
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 11648 bytes
SHA-256: 0470b77abdcca2192e0127f2e11caa5f86877bf6b6f73d557728d7c7cc862f25

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