Malicious PDF — malware analysis report

Static analysis result for SHA-256 166ea2f1f2125f93…

MALICIOUS

PDF

67.9 KB Created: 2021-02-18 08:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60e10b0810b207f755e8412f3a1d0606 SHA-1: 99af364f5d87b88cb2d293de8f1f665c4d44ab9e SHA-256: 166ea2f1f2125f9302c6671d2a940a062e8f31695046fcb3638cb918e162d8b8
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains text suggesting a lure for a movie download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=our%20man%20in%20havana%20full%20movie PDF link annotation
    • http://akmurzina.com/65850108944yy41l.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/YhjYgiy/kefimodorijov.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/yifcrgi/32056390583.pdfIn PDF document text
    • http://instahelpforbusiness.com/kuwivaribalomawuvisozeocky.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/heWojc9/sputnik_chandelier_rose_gold.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5feb0cecdb697.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/ergidhi/snappy_salads_menu_allen.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/eidhi0X/pico_de_gallo_restaurant.pdfIn PDF document text
    • http://lyudi23.ru/savatexizubirokijazomam62jry.pdfIn PDF document text
    • http://zebrait.fun/ballet_class_music0pxwq.pdfIn PDF document text
    • http://dkblogin-de.com/83964395964h8kig.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/DGdiiCw/batoluzofasavifa.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/idLCGgi/metotasazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palojolasorut.rf.gd/american_anthem_movie_free.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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 4916 bytes
SHA-256: e3021b94cfd1817fab837796fd30980f0cd678c7c78743a664b0a5a7ce20525c
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 10352 bytes
SHA-256: 65cf9471f5aa84002180bd3f626944a4d95dbbabd6a9a6dcbbbc7589a1a11a4b

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