Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c3463d6ea5eacc…

MALICIOUS

PDF

72.0 KB Created: 2021-03-23 19:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c1f1fa95be0268c0d716f0d3c76c2509 SHA-1: 11e9f5eaae526f24076564de22abfd8db41dd4d0 SHA-256: 79c3463d6ea5eaccc7381d21c353ec463917b4df14d08827f168dc9da6e1e766
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'inspector chingam cartoon mp4' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/123?utm_term=inspector+chingam+cartoon++mp4 PDF link annotation
    • http://carinsusa.info/38525177771dtlak.pdfIn PDF document text
    • http://indonesia2health.online/terms_2_10_n_30_fob_shipping_pointm3vhh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_60407f6d22afd.pdfIn PDF document text
    • http://ygrash.website/ocean_fortune_apkd8uak.pdfIn PDF document text
    • http://telemprom.xyz/a_dolls_house_by_henrik_ibsen_full_playman3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_600c9ddb6c138.pdfIn PDF document text
    • http://sreda.city/bescherelle_grammaire_download_freebsddr.pdfIn PDF document text
    • http://meetly.space/irobot_roomba_e5_5150hg8gt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5ffd458ccdf35.pdfIn PDF document text
    • http://fapseo.ru/zobuwemiluvozukmy13l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_602155568443c.pdfIn PDF document text
    • http://hisgohar.site/whats_the_difference_between_hero_7_white_silver_and_black3eq0u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_6007584e56242.pdfIn PDF document text
    • http://lekagodewod.iblogger.org/fopizakilukunatuzosiwudef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6015fe096e80f.pdfIn PDF document text
    • http://winoorama.fun/96732320154aubnr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_6053c9dd70617.pdfIn PDF document text
    • http://fruitslope.online/kesimigalipesabqkfkr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/7355dd21-069d-4200-b20d-abe4ffb19011/fizeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0ed1e2-8807-4bae-909c-1b799fac120f/97891144384.pdfIn PDF document text
    • http://renedutej.rf.gd/behavioral_activation_worksheet.pdfIn PDF document text
    • http://zuronixo.rf.gd/free_sample_of_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94561fc-3885-4eb5-aaff-8898374b2d62/campark_t45a_review.pdfIn PDF document text
    • http://midexudotag.epizy.com/jajimejip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 5340 bytes
SHA-256: 4cf38bc854b2c0db921bfc1015ff34810273518d87f9c792345cdabf8dca32fc
font_01_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10960 bytes
SHA-256: 0ab9016a10ab00f3c10c2768d22b589c9277ff938ef68326c29560705c94df93
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 3420 bytes
SHA-256: 96c78b5b03f214f6858509d409aa2b014ff1b6d8473658c59708fc041a12d9ca