Malicious PDF — malware analysis report

Static analysis result for SHA-256 3750bcb9c274947b…

MALICIOUS

PDF

78.6 KB Created: 2021-01-01 09:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c05c1a9ead2ae4fa899c6ae34186cb6 SHA-1: 113db67c227dc8267d3859fe3d76a7e511cb84b6 SHA-256: 3750bcb9c274947bcd079bd48325f37413617761002506f347acbe17e9d62b2b
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for a redirector link to 'traffmen.ru'. The ML classifier also assigned a high probability of maliciousness. Although no scripts were explicitly extracted, the presence of a malicious redirector URL strongly suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=common+size+income+statement+problems+and+solutions
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fe80778f3381.pdf
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f897ae5826cf.pdf
    • https://cdn.sqhk.co/panosiritu/ihishdC/pemowomizivomorikupuwa.pdf
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5fe2dd902aa72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xefejevife/glucose_control_icu_guidelines.pdf
    • https://s3.amazonaws.com/rezugekolaba/51277969195.pdf
    • https://uploads.strikinglycdn.com/files/07dbeeb2-5c77-41be-b364-96609f532b37/94963335916.pdf
    • https://uploads.strikinglycdn.com/files/3724f535-0dce-4175-85b2-746fc78fdc9b/folapujotak.pdf
    • https://uploads.strikinglycdn.com/files/64f16384-b4c2-4ae0-816a-335dec9af5db/dumugel.pdf
    • https://uploads.strikinglycdn.com/files/ec9441b1-733e-4703-a9e1-a9cdea5d077c/lovejoy_ga_weather.pdf
    • https://s3.amazonaws.com/xanebavifamopez/nj_fishing_report_barnegat_bay.pdf
    • https://uploads.strikinglycdn.com/files/3445a7d6-3115-44c0-adf2-86258ce990ef/vocabulary_in_action_level_h_answer_key_chapter_6.pdf
    • https://s3.amazonaws.com/fajixe/7327603449.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_off0000f400.bin
d1286c706255fcf3e2db656156540b4727c33b721704ca9814f52aee07134925
pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 5312 bytes
font_01_sfnt_off000105f4.bin
4a8755ddab2a40545e50112eb5609450f5980ad05cbfcdf109c11fccaa444eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 11484 bytes