Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a711a213a8a6640…

MALICIOUS

PDF

78.5 KB Created: 2021-01-31 02:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 02b7a30f09f88f69d8acce8772365e85 SHA-1: b86a8e867687b49a848a808441a5f608aa82222a SHA-256: 0a711a213a8a66402954f00756cf779fc5f96bb23a477121a689c58a991a19c3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous links to disposable hosting indicate a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=skip+e+lowe+personal+life In PDF document text
    • http://ilmahli.com/9499333598ajgf4.pdfIn PDF document text
    • http://bizbize-yeteriz.org/36279912846ycskp.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/fOhgiaG/rinawudex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6014ac4b78fbb.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/dg6SiiT/15882763689.pdfIn PDF document text
    • https://cdn.sqhk.co/xinoxoxojib/ejGIif3/flight_simulator_pc_game_highly_compressed.pdfIn PDF document text
    • http://centerverifybadge.com/91696737093z077p.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/MIieJnI/13810465388.pdfIn PDF document text
    • http://tefulen.iblogger.org/lezegaximetupufenaxape.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
    • http://supidanerij.epizy.com/39935556597.pdfIn PDF document text
    • http://jufakoxageponuz.rf.gd/96679255407.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/amrapali_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/nedabefuwibux.pdfIn PDF document text
    • http://xasidesarilune.epizy.com/fallout_new_vegas_starting_stats_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 4860 bytes
SHA-256: 80a7973a8b78c4f3d0a63172d7f8e178b7dff05f4277238a35bb0ca104c8e267
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10636 bytes
SHA-256: 5e315da684a93e0088c288f9302e496a071708da545bc08c5d29122464a12bcb
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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