Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1ae482785c9732…

MALICIOUS

PDF

82.9 KB Created: 2021-02-26 22:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 467b74f4179801f58a0b90d6083975c3 SHA-1: 660605cc64cca7fc8fc44670f12549a695af6f76 SHA-256: bd1ae482785c9732c76108834fcad1b17ccd9961d1388df97b69cd98aabeb994
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://bologen.ru/strik?utm_term=how+to+install+printer+hp+deskjet+2545 PDF link annotation
    • http://kipokefurur.mygamesonline.org/free_story_elements_worksheets_2nd_grade.pdfIn PDF document text
    • http://tvoyoproc.fun/7703870199502vb9.pdfIn PDF document text
    • http://winoorama.site/38217316452ljovr.pdfIn PDF document text
    • http://soxexuv.iblogger.org/78019429879.pdfIn PDF document text
    • http://help-copyrightservice.xyz/maxiwuzunetemiao3hc.pdfIn PDF document text
    • http://idealica-itufficiale.website/57487362359igyti.pdfIn PDF document text
    • http://heartcenteredequestrian.com/super_mario_brothers_2_wii_gamea7vy5.pdfIn PDF document text
    • http://ruzopiter.iblogger.org/kingdom_come_deliverance_guide_book.pdfIn PDF document text
    • http://1yamal.space/91402687845so7ox.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/3375929940.pdfIn PDF document text
    • http://ins.expert/775976806en33l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzeparuzibez.rf.gd/90376274458.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/gusojerukejozuwevuti.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/kafejokulorugaker.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/zajulebavisufimuranis.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/75696182331.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_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 5584 bytes
SHA-256: b801e47c886b0f33dcafca70d769df4e135db8b2477878f6a448be3b8559ffdf
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 10496 bytes
SHA-256: 7080200416051ae886212d44f4479c502f2d6d565614a5227d708bd14cb54626