Malicious PDF — malware analysis report

Static analysis result for SHA-256 316906250b4b0be5…

MALICIOUS

PDF

112.8 KB Created: 2021-03-16 11:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91a19c15e1c2858e8caf83ad873acd6 SHA-1: 204a5fff45f72204c28bbb85a17d4a96f11759dc SHA-256: 316906250b4b0be5b985861727c2150521a17847d6d1aa639df6d2e8dc0fc016
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or refund-related phishing. Although no scripts were explicitly extracted, the presence of numerous external links, including one pointing to 'seumenha.ru', suggests an attempt to redirect users to malicious sites or gather information. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=polaroid+300+three+blinking+red+lights
    • http://about-igsupport.com/24626463638k0aix.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/1664863.pdf
    • http://alphabitx.com/951080668712vlk8.pdf
    • http://24goodstore.site/rumokumufalo4byv6.pdf
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/fituxafagudix_jezeboro_noluseri_rajusofumemu.pdf
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/fd85d.pdf
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/b2dffd34637a4.pdf
    • http://remontvorot24.com/most_epic_dragon_names848uc.pdf
    • http://mxbur.fun/mumokidifeko3pv2y.pdf
    • https://rasiwumuseb.weebly.com/uploads/1/3/5/3/135350461/mekuronijujes.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/rejifoletukije_desetal.pdf
    • http://taptopbot.com/how_old_is_vesemir6qjaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b4eca5e-b6e9-4d2b-9df5-def78658a402/xufobevuluxutukewalifuk.pdf
    • https://uploads.strikinglycdn.com/files/21fc5565-dea1-4655-8483-181e25ae126f/7966913332.pdf
    • https://uploads.strikinglycdn.com/files/132b5ee2-ad3e-4857-977a-a8e575959ae1/safe_haven_security_salary.pdf
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_4443d2a6a3da46c0aeb3e44fcf2de88d.pdf?index=true
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_016d5eba8ee84b15a32e3ba2568eeadb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6369fd3c-c872-4a40-ab10-6ba7f6c7ba60/nixofa.pdf
    • https://uploads.strikinglycdn.com/files/202bb5a7-2233-4695-b1fb-ae83ed3045c6/gopurani.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017abe.bin
ab65f4e7db3f422f0d0cbb82672de5151a65dd3fd5baf874bfce9983bf36aac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABE 5596 bytes
font_01_sfnt_off00018db7.bin
9312d3176fd65c094d340212b3e5d301a3c4611de88b8acd732a7e5611b6b067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB7 11948 bytes

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