Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f34bbeb16e39ad…

MALICIOUS

PDF

83.9 KB Created: 2021-04-06 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71d9f623f3157b9b47f72e12f5f44be6 SHA-1: 2308fa0d781c5e821deb461fd53555c205d8a5c4 SHA-256: 51f34bbeb16e39ad856be7df7589a7d6414c0731d30af33790864860dcf8ee94
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting a link farm or a distribution mechanism for other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://baarspo.ru/strik?utm_term=husky+1750+pressure+washer+wand+parts PDF link annotation
    • http://titanof-filtr.ru/best_kings_questazh2w.pdfIn PDF document text
    • http://alcexpress1.xyz/how_to_find_figure_drawing_modelswy2j3.pdfIn PDF document text
    • http://olymp-trade.top/903602515193acud.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/hifJKot/pass_with_flying_colors_phrase_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/hjhdz3V/lil_peep_xxanaxx_tentacion_falling_down_lyrics.pdfIn PDF document text
    • http://itclick.pro/white_boy_shuffle_quoteszaogq.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/ZUljdhb/10889874345.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/eYkRDnu/can_you_escape_2_level_9_game_room.pdfIn PDF document text
    • http://tovelksa.website/pamixesuvedaloj82hkn.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/jcziahb/julelagimurelovenasapu.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/xuyKgef/76960801885.pdfIn PDF document text
    • http://uscreditinquiry.info/4407908405179srt.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/h5jhNWd/sexaxutemofuwogenisinatuf.pdfIn PDF document text
    • http://draiwenstore.online/posugigawebulunufufopo5m1bf.pdfIn PDF document text
    • http://garantiya62.ru/nodikoko5jcp2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_1e77e82aedd64d01aef6fb766a1ca653.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_018d1074babc4272bb1ad33088990357.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_8d658fbd0b274230ae7790a80bf7598c.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_ba254e1dd54c4d9e95ead4963f0ef491.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_e3365b1008e549b89ff675a2807d4102.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5356 bytes
SHA-256: 3760aac9834c3f1d5f83820e962e22d55adf2211992332a4376c52d64591c6d4
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11200 bytes
SHA-256: 631b329d5055c9bd70af5bc9052584ad55b76ea1a9ecbe143dc9afd59e5acd5d
font_02_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3