Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2943a43adcbfc12…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 04:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fa973c2d995071f4f5ea63789f261b32 SHA-1: 53f0166229bce121ebef226d8225c98402479041 SHA-256: a2943a43adcbfc12215f418da1b951bf1c557988973e4c7c423a2a0ffda6622c
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 0.9993

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=printer+brother+mfc+j2330dw+pdf PDF link annotation
    • http://rovanenafet.getenjoyment.net/fofujejele.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/dMWUgiM/senigupezevupupan.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/ojahd4s/carnival_games_ps4_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/dhbhdhj/amari_lte_100.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/ragurip.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/RtjtRjd/97615095928.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/mosizoka.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/ages_and_stages_social_emotional_questionnaire.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/what_is_the_best_sequence_to_watch_marvel_movies.pdfIn PDF document text
    • https://jomezafivawig.weebly.com/uploads/1/3/1/8/131856232/a5ff5a0f3f2c153.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/41749267828.pdfIn PDF document text
    • http://digovin.getenjoyment.net/ketapugonapusirujes.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/7854360.pdfIn PDF document text
    • https://bijuvija.weebly.com/uploads/1/3/5/3/135306534/b3f2d3b06.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/tmgiha9/common_bacterial_infections_in_puppies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26eac18-04fa-40e2-90ad-27cddb204628/icom_ic-756_pro_2_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b5b5ff-22bd-4e9a-be1f-e86ed49d9800/free_ripple_stitch_crochet_scarf_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/26971722169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f6aee6-9e63-4685-9b39-a8c6264a99c0/nidotetologutidilitipa.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/wetivulozilune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df941e0-e01a-4e82-8a63-efd9817ae84d/ariens_824_snowblower_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/champion_song_dj_bravo_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5325596b-359a-458f-bee4-7e0f597fcf31/33274984027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4eab53-fa00-48ba-9069-aafae2fd2ba9/76776435987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f7f834-341a-49c9-94ef-706569b505a9/jquery_interview_questions_and_answers_for_experienced_in_asp.net_mvc.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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5720 bytes
SHA-256: 3322303c0db25374ce0f175dea2b903720a16f8f0d61e6c10e592b5efb2bf99e
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11420 bytes
SHA-256: 4403783d7ec257f3ac17703a88c29f3e8fda927eca1e2cdbe6c375cec49a024f