Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d7b2d464b93e9c…

MALICIOUS

PDF

88.0 KB Created: 2021-04-01 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3b1e2b462d73178dd53bcbc68ade3510 SHA-1: afeeab89eb92de2c78bcca1e416828b58eb5457d SHA-256: 39d7b2d464b93e9c3cbe2da330e264e92e669b29167c9a45791eded50df326c7
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV detection. It contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to router reset instructions, a common pretext for phishing or malware delivery. The presence of a 'password-protected archive lure' heuristic further indicates an attempt to conceal a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/strik?utm_term=how+to+reset+my+hitron+router PDF link annotation
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/8522922.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/bizifo.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/aSmjiSH/40412613887.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/OvicQbU/adidas_outlet_sale_dubai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6056d28727b6b.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/jgjbfeC/ice_crusher_machine_target.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/ggehjdW/tukuwozowu.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/lametovemebirisoluv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_603950e17064d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6006d9cb52344.pdfIn PDF document text
    • https://jonaditogun.weebly.com/uploads/1/3/1/4/131408899/2807292.pdfIn PDF document text
    • http://biwalataluru.22web.org/lakidozop.pdfIn PDF document text
    • http://rimugojitiwimun.iblogger.org/xajovebiruxa.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/1Ihigh7/81034073469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_602fdd3c86db1.pdfIn PDF document text
    • https://ratamugokamilel.weebly.com/uploads/1/3/5/9/135959592/8a08c8fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godutiliwaganos.rf.gd/live_sports_watching_apk.pdfIn PDF document text
    • http://wawefib.rf.gd/23413575320.pdfIn PDF document text
    • http://latisikonif.epizy.com/kexewusago.pdfIn PDF document text
    • http://gaxopuna.epizy.com/como_es_una_composicion_escrita.pdfIn PDF document text
    • http://rafodize.rf.gd/lumudunemazubugifet.pdfIn PDF document text
    • http://vinudade.rf.gd/atharva_veda_in_sanskrit.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/69303265158.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_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 4840 bytes
SHA-256: 5f965f8b8042cf4781d4aa8bf3ff106aa52659f3f9b50be645cca4fa6f97a115
font_01_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 11152 bytes
SHA-256: 36d3565771803ebc752166b968d6d4f8b69919e5b1b902b9ea3a65218e4a714b

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