Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ed58500392401a…

MALICIOUS

PDF

72.6 KB Created: 2021-02-07 14:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8096add88adfaeca73aeba33ad115be SHA-1: 9e932a0c040a2e11ae795cdcdadf35c196f4122d SHA-256: 89ed58500392401ad9c4f1fe23f28c16b191e3fa5eecca510a63616bdc8ebea8
214 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. It contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/aws?utm_term=2012+cadillac+cts+4+owners+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fcc0d99cfcd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5fdaeff54452d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485807/normal_5ffbf82db45ca.pdfIn PDF document text
    • http://keribek.22web.org/bench_press_form_chest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5fc7f0512b728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe45bc5422e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ffa1fad3d937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fd9d651c7662.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/3630663.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/sobaketemu/chicago_bears_football_uniform.pdfIn PDF document text
    • http://lepalatibig.epizy.com/best_audio_editing_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/symbolic_interaction_theory_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/subob.pdfIn PDF document text
    • http://wivovazu.epizy.com/babuji_dheere_chalna_full_song.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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 5380 bytes
SHA-256: f73935a7211b6f0865b078f6afa801221e221e8750d3b63c3fcb280581c7d8ec
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10316 bytes
SHA-256: ab06b1f286e697b62cd6f7d7856895af3e4300bef17991d8afc2245f819f4fe6
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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