Malicious PDF — malware analysis report

Static analysis result for SHA-256 22df658adf4bb3ca…

MALICIOUS

PDF

87.4 KB Created: 2021-04-03 09:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e9dbd2f5972ec462c0f2d88db7f8f565 SHA-1: df0c9450e3d1805ddba08b3d951ee8561223b2b1 SHA-256: 22df658adf4bb3cac75ef052c70ab48ac4f96c5b2b8060f3606a8449826879b3
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized pages designed to appear as legitimate download sites for various content, including legal dictionaries. The primary lure URL, 'https://gimoguvi.ru/award?keyword=black+s+law+dictionary+pdf+download', is flagged as suspicious and part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=black+s+law+dictionary+pdf+download PDF link annotation
    • https://cdn.sqhk.co/kasesiseb/hgic7tf/20823750410.pdfIn PDF document text
    • https://bogiziva.weebly.com/uploads/1/3/4/3/134338427/jegosojiso.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/dhgUq48/download_music_hamba_by_q_twins.pdfIn PDF document text
    • http://creamwalls.online/how_to_fix_the_sliding_door_on_a_honda_odysseyvas36.pdfIn PDF document text
    • http://damvglaz2.xyz/zulupikevlm9n3.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/boxubofoguj-pubupofinu-dobareri.pdfIn PDF document text
    • http://lixebafevoku.mypressonline.com/67633608981.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/futaru_kumalisazi.pdfIn PDF document text
    • http://tabikola.online/decision_tree_examples_in_r9kuda.pdfIn PDF document text
    • http://b0xberry.online/94230696353cla04.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/sebiveparupelumiwedured.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/gcjeqAX/fiba_basketball_champions_league_2019-_20.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jajdGjc/bebexizenuxofuwiniw.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/difapetunono-bemapezofuso.pdfIn PDF document text
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/natoxofumuvakar-lujuvibogozom.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/Bgcidgg/swtor_blaster_rifle_sounds.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/fowikorejodi/40813188933.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/sparkle_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/transformer_centiare_en_mtre_carr.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/credit_risk_management_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/logowulumazufogisazavolu.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/gidikagugakuxasizoduvet.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/ziwipoben.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/archery_king_mod_apk_latest_version.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 5456 bytes
SHA-256: 3469cfa78cbe7dd3e0cb56c53c3c3b6aa34fa8e963337b3808ae8eaf758d3bc5
font_01_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 11472 bytes
SHA-256: 32962ca6f6ac9902db4aea35728a2785f2f8a2070f61da69fac81044f5c81f76
font_02_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174