Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c41ddbe8d33074c…

MALICIOUS

PDF

73.7 KB Created: 2021-02-01 08:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ff4ba4c29802210656e08462d52ba4 SHA-1: ecbe10801b2dc9df0ace19dde1d96fc10cd484ba SHA-256: 2c41ddbe8d33074cba87246bbd85b3b24daec420b43e169512e4e88ba61a20e4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=poison+tree+poem+analysis
    • https://cdn.sqhk.co/masunidupag/gRZhi3N/98345442773.pdf
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/8824390.pdf
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ff23dbf46cab.pdf
    • http://reduslimitalia.website/xapemebiwexerd86jv.pdf
    • http://tvoyoproc.fun/california_nclex_pn_results4pid7.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/0a6b1377bc927d3.pdf
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fce8c3a75985.pdf
    • http://shoop-fl.ru/checkers_hyper_jobsdaoht.pdf
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5ffe26899743e.pdf
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/digokipodaxop.pdf
    • https://cdn.sqhk.co/wazafanez/tzjcGet/subway_surfers_princess_runner_mod.pdf
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/ketup.pdf
    • https://cdn.sqhk.co/padixemugex/7iafhes/jutepirajapixidoxavere.pdf
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fed02c34b081.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buxoparadazegu/nokilobuvuxika.pdf
    • https://s3.amazonaws.com/jadudusujuje/golf_clash_caddie_free.pdf
    • https://s3.amazonaws.com/nigimul/metal_casting_process_video_free.pdf
    • https://s3.amazonaws.com/zalomi/bonovizipazuzimuvebezap.pdf
    • https://s3.amazonaws.com/numunenoji/javanitijigevekide.pdf
    • https://s3.amazonaws.com/rovuweraja/avg_cleaner_pro_apk_4._4_2.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_off0000e5df.bin
97798a0364c669a3d8efa0a2fa9a799d4549a9da989b9946d121bc4cfe9cadc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5068 bytes
font_01_sfnt_off0000f70b.bin
bffab994590a1d9b659d81fe8b8ea36acdefc877e9c2ad4a28007a4aefa6b09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10448 bytes

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