Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ff6a10559bd01…

MALICIOUS

PDF

74.1 KB Created: 2021-03-26 18:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7088b6455ebd98dee2f7c324309f70e SHA-1: 93ea13a04e83f88e8d73e04108a4fd4032896335 SHA-256: f91ff6a10559bd018959b1758bcd3b27d7feb0105bee91c8e16482237a7ce31b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=okonkwo+character+analysis+essay+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409813/normal_604f2a739d302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_604fcdf78b341.pdfIn PDF document text
    • https://marajivo.weebly.com/uploads/1/3/4/8/134878422/dudedupev.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/rvhdnhe/monster_city_fresno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fd0a21087ff0.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/pgfwXie/2776039099.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/KN04hh6/talking_tom_cat_2_online_play.pdfIn PDF document text
    • https://kexiberuvulom.weebly.com/uploads/1/3/1/4/131409574/ca1e0.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/2abf7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_605d4c179e331.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/regegozumekoza/14884685261.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/bmo_mobile_app_fingerprint_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/el_amor_en_tiempos_de_colera_audiolibro.pdfIn PDF document text
    • http://lojarine.epizy.com/canon_rebel_t6_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/nevomamurexajilibipotuxow.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/rifabozuxut.pdfIn PDF document text
    • http://duxasowasosa.rf.gd/latest_delhi_metro_map_2020_download.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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 5528 bytes
SHA-256: 21ac2e6938e6aebac58ee1bad1ae62d6de87105f8b41040d95e949f600036134
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10432 bytes
SHA-256: 894ee6ab7af84ce3c8d3bd95ce52d4dba633f10799462ab0555a00467d4a2e12

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