Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a56a9dda73fdb23…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 20:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 62dd9fb573c4148475cb927bc197ae22 SHA-1: 10a52ffaf65e05e3852cce0d10595fee0e6693c1 SHA-256: 3a56a9dda73fdb231b721170b91f5b2f15d39f8ed084745c8567b909773aec18
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating that at least one link points to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure related to strengthening neck muscles, likely to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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/strik?utm_term=how+to+strengthen+your+neck+muscles In PDF document text
    • https://cdn.sqhk.co/jowapezo/J7Wlhgv/desert_rider_sandwich_shop_jacksonville_menu.pdfIn PDF document text
    • http://richteam.site/seventh_day_adventist_hymnal_ppter8dr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_5fd78bd354e8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5ff69befb2344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_6015368315a87.pdfIn PDF document text
    • http://storeyou.store/gakusamatijobengpwtu.pdfIn PDF document text
    • http://perevod24-card2card.site/vegarawumugafivufeledioq1dm.pdfIn PDF document text
    • http://hydra.moscow/neo_lms_login_fsuus7bwv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5ff579bd6d293.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/hjPhdKs/legendary_warriors_mtg.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/djjIgds/rpg_for_destiny_mod_apk_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fe60fefbdad3.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/ijSjheo/webunuxurutumudozujidaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60145dbc59e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_600f63805e8c5.pdfIn PDF document text
    • http://worldhold.online/764352021027mrm9.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/pokixovuxik/adobe_photoshop_cs2_version_9._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/basic_instinct_1992_tamil_dubbed_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/dirumopikavosavidi.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/tonegewafotove.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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 5224 bytes
SHA-256: 398425d4da54c8dcd644733b2890e5e8020f4cf1d113bcc3ed47938832b1f41c
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10704 bytes
SHA-256: f0d8110237c062f85f7740b21142cc9d6e2851fb90c8a11659debcd2fb9ab630

Open this report in the interactive analyzer, or submit your own file for analysis.