Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b42262d2659e838…

MALICIOUS

PDF

70.8 KB Created: 2021-03-10 06:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 022b67ccc0d3d9045ff56998235e7eb7 SHA-1: ffb2451f190ab35617c691a2769db5fca68d0968 SHA-256: 8b42262d2659e83893fd42696ed18c3d9e33b163bb2362acffd0ed6cf2ec0491
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's designed to redirect users to phishing or malware-hosting sites. The PDF structure and embedded links indicate a link farm tactic, likely for distributing further malicious content or conducting 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 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://xajibur.ru/wb?keyword=pioneer%20vsx%201123%20remote%20not%20working PDF link annotation
    • http://qupieasy.online/jevamopusekukomix5s7xn.pdfIn PDF document text
    • http://tawilexupo.iblogger.org/centrelink_report_income.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/tkb_guru_agama_islam.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/bittersweet_ski_club_forms.pdfIn PDF document text
    • http://rutamijojiru.iblogger.org/why_were_political_parties_formed_in_uganda.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/78c40ec5c7df.pdfIn PDF document text
    • http://carinsusa.com/possessive_pronouns_worksheet_fifth_gradei9b9h.pdfIn PDF document text
    • https://cdn.sqhk.co/naxopesareg/igjjjaw/nepatozuvafesexodowepowi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/RjdNqhg/wanesolunedu.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/can_i_take_sat_in_9th_gradeg08z5.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/44dd0aba3c85a3.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/polemilokelu.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/conan_exiles_knochenmehl_herstelleniqtez.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/o50hjl6/tangled_songs_in_order_lyrics.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/legenapi/35694248306.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/gubbi_mele_brahmastra_songs.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/90491794339.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/dyson_airmuscle_dc28_animal.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/28838103111.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/convert_adobe_3d_to_step.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5396 bytes
SHA-256: a034aef23aeb68f17f56c513784300f73daf0e2ae355c5c21020563ebe258852
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 11312 bytes
SHA-256: a3f127266434f702c018b16de26afc367edc14bb27b2e80cbb6366830a0a0c66

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