Malicious PDF — malware analysis report

Static analysis result for SHA-256 7770e1d7699ac0a4…

MALICIOUS

PDF

63.7 KB Created: 2021-02-16 23:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 572ead94f4d23532f83b348f3e6706ce SHA-1: 67b1e4fb3ff38489302fedb54f4940d396e7770f SHA-256: 7770e1d7699ac0a44617826a0896045aad10a4ce290b3ff6a6b5bcb09899a2a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary malicious URL identified, https://baarspo.ru/strik, is likely part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing.

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://baarspo.ru/strik?utm_term=the+animated+adventures+of+tom+sawyer+1998+full+movie PDF link annotation
    • https://cdn.sqhk.co/liripudeb/hieieXj/86645000693.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/ge9hdja/52667126908.pdfIn PDF document text
    • https://berigagagek.weebly.com/uploads/1/3/1/3/131384675/7839953.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/gases.pdfIn PDF document text
    • http://agent-spv.space/lefujoraronobuvegetazuzo949q1.pdfIn PDF document text
    • http://maewallace.com/tulja_bhavani_naa_songs1t21k.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/tKWYhgS/19048155903.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/mR2hahc/steampunk_clothing_ideas.pdfIn PDF document text
    • http://pet-guru.shop/sword_of_truth_terry_goodkindf5atk.pdfIn PDF document text
    • http://helplnstagramoffice.com/86510382719veg2v.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/hcuihhg/cissp_domains.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/sumesawoxajew/unication_alpha_elegant_pager_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/romepu.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/72848779171.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/barcarolle_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/biblical_verse_on_answered_prayers.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/what_size_screws_for_lg_tv_stand.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/xejubilukarinidaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/49150982710.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_off0000bb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 5752 bytes
SHA-256: 0fdc4eef4634e95a71d4735241861be4edff48912da1f9bf158659518d6fd519
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 10052 bytes
SHA-256: a193d0ff3237bccf2575e801c1e79ae4c7d079acd623f1941ff12542cee50df2

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