Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a72e873954ae6f2…

MALICIOUS

PDF

94.8 KB Created: 2021-01-18 22:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2afbbb1a65d9ec8c27c62996e5933904 SHA-1: 184caffe59ec2f892f520900a27a0558e953f167 SHA-256: 9a72e873954ae6f21c4c914327d71a5272b1459dac8246e15df83bad3dde0970
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of such tactics to obscure the true destination. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

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://trafffe.ru/123?utm_term=rune+factory+4+memories+guide PDF link annotation
    • https://site-1214372.mozfiles.com/files/1214372/how_to_get_followers_on_tiktok_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fe89ef585362.pdfIn PDF document text
    • https://site-1176410.mozfiles.com/files/1176410/fast_racing_league_wii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fb8ef88a5ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5ff4ffbcb2dd9.pdfIn PDF document text
    • https://site-1211292.mozfiles.com/files/1211292/93617011148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ff3838f95e74.pdfIn PDF document text
    • https://site-1185312.mozfiles.com/files/1185312/teaching_aide_certification_texas.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/afcent_reporting_instructions_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5ff5c58386c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fccf580bcd82.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://s3.amazonaws.com/ginutu/23820600413.pdfIn PDF document text
    • http://novosumagib.epizy.com/22058248993.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/chuyn_i_file_nh_sang_jpg.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/lojapoketig.pdfIn PDF document text
    • http://xarifilaf.rf.gd/castrol_edge_0w30_data_sheet.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/muzim.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_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 5388 bytes
SHA-256: 9fae019e69a3686f56471672906a6a4016fa506e591e869acb1ff87cb50cd750
font_01_sfnt_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 11120 bytes
SHA-256: 481ecbb6e95a621eb796be9bf662db2e61d61335f816a5bc017c7ebdc69dfb5b
font_02_sfnt_off00015fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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