Malicious PDF — malware analysis report

Static analysis result for SHA-256 873c21027ced6240…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 10:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db84f2aac1e12b400c2c733796fb10ee SHA-1: 110d2c1af576d474473c6a5bc0a4900e0e37d774 SHA-256: 873c21027ced62405e349ddec052edb9b809e1fbb4a554a8d0e651d2cdce54eb
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=software+adobe+illustrator+cs6+portable PDF link annotation
    • http://autoupgrade.website/vinujin510c.pdfIn PDF document text
    • http://pesale.pro/81653452519r1gpg.pdfIn PDF document text
    • https://jeralizijofuki.weebly.com/uploads/1/3/4/7/134710598/e38eec82.pdfIn PDF document text
    • http://virelodefe.iblogger.org/blood_bowl_2_team_builder.pdfIn PDF document text
    • http://kupivse.xyz/sat_practice_test_2_answers_20173jqc6.pdfIn PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/6640337.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/deadpool_first_comic_worth0yb86.pdfIn PDF document text
    • http://leree6.club/how_to_setup_canon_pixma_mx340_wirelesszb4ne.pdfIn PDF document text
    • http://martakkord.ru/how_long_does_it_take_to_make_bread_in_cuisinart_bread_makerdkzwv.pdfIn PDF document text
    • http://hellesypakk.online/vonesomuvawamuviwugs0uf.pdfIn PDF document text
    • http://clientbluebadge.com/dari_ke_word_candyfipe8.pdfIn PDF document text
    • http://oneitstore.info/payday_2_god_mode_mody6he1.pdfIn PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/9534086.pdfIn PDF document text
    • http://cyberghost.store/wujijuragujixujozumuvgaxnb.pdfIn PDF document text
    • http://damvglaz0.xyz/74250073514vwf0j.pdfIn PDF document text
    • http://trixy-matrix.space/640551670940xlnj.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/the_millionaire_next_door_audiobook_mp3mzsv8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvalinifotu.rf.gd/90327209652.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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 5636 bytes
SHA-256: a87f7cc2660d902e94cdb8f184bfe97bb7c6fe079de1bcab64ee5541857b6c11
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11172 bytes
SHA-256: dc009cbdb2ac1781c1a0d7a26ed6bee516f84bc43068e6cfd2433e4db3ba30ca

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