Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35ad304e2b6d1da…

MALICIOUS

PDF

70.2 KB Created: 2020-12-26 18:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1fe1b92f9b36c08542305c75ee4c48a2 SHA-1: df969345aed17ae432025e1dde45b982adcf02b2 SHA-256: a35ad304e2b6d1da3798d957663e3a94b0e012f120ec74ef20031641a2426c92
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes a reference to 'dance classes for chicago', likely a lure to disguise the malicious intent. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ggtraff.ru/strik?utm_term=dance+classes+for+adults+chicago In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5f9d5977b18c2.pdfIn PDF document text
    • https://gumopukuzi.weebly.com/uploads/1/3/4/4/134481114/6174225.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/HojcCjh/seesaw_ball_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavobawum/81636699411.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/dikaponedafofawik.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/54611058352.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/finaxituj.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/latitudes_1_cahier_d_exercices.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/azur_lane_formidable_dio.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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 5280 bytes
SHA-256: aafc7064348dab645d3aa42f0606b3e01f1a56618d7f93c0f7098b33a16d7aa7
font_01_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 11564 bytes
SHA-256: ba2e3278e25089bb1a2a19fc02e87d0caacd2bff04c8fee3a08a59781db40397

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