Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe4f0151562c393…

MALICIOUS

PDF

82.4 KB Created: 2021-04-03 17:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34052813dd601860e4c9ada7484a63db SHA-1: 10b8208f4853772d3fdd486e33077f1747e8dbb7 SHA-256: 6fe4f0151562c393d995b8265e688d68eaa7f7156391eb36c07b375321f7efd2
186 Risk Score

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 0.9996

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=phi+chi+theta+uiuc PDF link annotation
    • https://cdn.sqhk.co/janawezexoj/hfat6hf/xenazefugigane.pdfIn PDF document text
    • http://idealicagocce.site/20698056656iw148.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/best_automatic_blood_pressure_monitor_2020.pdfIn PDF document text
    • http://wekeb.space/stars_in_the_night_sky_with_moonbhziy.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/uKFjcja/2020_indy_600_adventure_137.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/liwozutapat.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/spelling_words_for_grade_6_with_meanings.pdfIn PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/xebelewagevuzu-pugijinazulebep-guxugexozotu-rivowasofo.pdfIn PDF document text
    • http://idealica-ituficiale.website/free_online_games_to_play_on_chromebook6845n.pdfIn PDF document text
    • http://xagevogewa.medianewsonline.com/affine_and_projective_geometry_bennett.pdfIn PDF document text
    • https://pokifuduxorimib.weebly.com/uploads/1/3/4/5/134501468/b7d5e167ffbb096.pdfIn PDF document text
    • http://xitnet.fun/jowajofesogusafupx6umu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nobapizasiwe.myartsonline.com/31703162745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a59b3ff-58af-4ee0-94e7-ee7e8b3f72c8/htc_one_m8_camera_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63c58e3-e0eb-4e14-9413-3eb2d1e36d2b/sudujem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c001ed-c80f-4faf-a266-4c928ca6e644/senukuwovabalejexudet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c581e5-cb99-4d28-81df-a62fabae16e8/object_oriented_programming_design_principles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697763f9-e1c3-4dcd-8db1-9cfec66bdc34/forotakigopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b1c6a2-e4e7-4cd6-ad05-a63a83050828/48228653253.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/ponerajitujisibijate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbf35d2-2e4f-4229-ad24-aaa95a4eacfc/electric_circuit_problems_and_solutions.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000122c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x122C9 16888 bytes
SHA-256: 52c9adcca337f49898927ccc1d058a0d959a80d690cbc3b991a60681df79fa66
font_00_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 4580 bytes
SHA-256: 2aad55cb54e7e658167132d0efb3f8fea2d62c8a6ebfc2001d03355491ecc3c4
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 11780 bytes
SHA-256: b061fc8d90839523ca6c06372abf5401f2d33568f971b9d5ccaed4c1a9965c44