Malicious PDF — malware analysis report

Static analysis result for SHA-256 795666767ab82788…

MALICIOUS

PDF

72.0 KB Created: 2020-11-11 23:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2ef95bd3d8c8cc3a96f75399526c18d0 SHA-1: 9be4688cbf8aea58b50ba5aa7d399dd7da3f3bf9 SHA-256: 795666767ab8278852a6ae7464fef5add8adcd9c0e9d0b5b785b7385bc2a4a71
234 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains elements suggestive of a callback phishing lure, indicating an attempt to trick the user into initiating contact for fraudulent purposes. The presence of numerous external PDF links, some pointing to benign content and others to unknown or malicious domains, suggests a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=cda+council+renewal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f9cac1242b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f921217c498c.pdfIn PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/nitagokiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a55ea4-5d89-4a8b-b909-4109df124fd8/interplay_the_process_of_interpersonal_communication_13th_edition_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d0a8ba-6c7a-469f-8378-674974d812c8/patigenibiko.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/clinical_psychology_research_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb596a00-ec6f-4d90-bda3-ee7240552d64/kuvulusano.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/help_spay_neuter_clinic_newnan_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/dnd_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2900380d-1e59-4b46-8fca-cc24b05f4449/rejoxajosetelup.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/73367900594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b564dc-9865-484b-9912-21ec0d7b0e56/48136829308.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_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 4752 bytes
SHA-256: 349cbfc3a0c5d67e3647fad154dd1fd54d271306654c325dd62c519c5c1c5d4a
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 3084 bytes
SHA-256: 110009dd1e8367b15080aac0f89a88fa741eeb514169369627b3a0d6d212e7a8
font_02_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 11372 bytes
SHA-256: 5626e77b54ff9c10c50bb538a0ff2f0f857d679b3cb9e983c40f4a79fa83f0f4

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