Malicious PDF — malware analysis report

Static analysis result for SHA-256 4813cc3c2c260554…

MALICIOUS

PDF

78.3 KB Created: 2021-05-11 22:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5a50ee63fbcf7bf20630f7eb20cdef0 SHA-1: efabe0397a24e8bfc41ccb0196684d30511dc8e0 SHA-256: 4813cc3c2c2605540d49400d1674af2b47a2ae9c7748d59baf288b59be2790b7
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 external URLs, many of which are hosted on disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'grounding at home', which is likely a pretext for a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=how+to+do+grounding+at+home PDF link annotation
    • https://cdn.sqhk.co/jetekujob/cpjbhfA/vonomunuxifafun.pdfIn PDF document text
    • http://visiblawty.com/97517367992oo8pr.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/gjahf6t/wood_turning_game_stress_busting_slats_vertical.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_6039e46e8087f.pdfIn PDF document text
    • http://swiss-gear-top.xyz/70623291439e6f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fd21bdd984a8.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/daccee8f.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hevic9V/retrowave_font_photoshop.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/5772273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_60145ea339b51.pdfIn PDF document text
    • http://sodalabs.pro/ayyappan_child_hd_video_songscytsj.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/ba372d.pdfIn PDF document text
    • http://lightsex.ru/tabefezotonepisodexosk67z3.pdfIn PDF document text
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/97b22a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_60589ade972b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5ff717b25b520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fdafdf550aeb.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/muvupoxebar.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ijfje41/nogetifusikebej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazusokilole.rf.gd/sewati.pdfIn PDF document text
    • http://ravakalamixalu.epizy.com/best_way_to_learn_how_to_read_financial_statements.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_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5080 bytes
SHA-256: 001efa02c341b9efd40deb9b3115b162e09778abdd260282b3647e8f5ff16d20
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 11064 bytes
SHA-256: 6f4d4e40d2fadbb0672f1ccdc21268729b3a198d3d2ca01ebda4c6bdaea6bac7

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