Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21a32fdadba410b…

MALICIOUS

PDF

64.5 KB Created: 2020-11-25 21:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9e026f00402feef7a1d421df5b125ef0 SHA-1: 1e226afed571fb349981e00b16a00265b44b7fc2 SHA-256: b21a32fdadba410b93df267fbec7deb93b5bc9d29e8164fec09a44a8956aebdb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute phishing lures or malware. The presence of multiple external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/strik?utm_term=optima+marine+battery+box PDF link annotation
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/9ab3da.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/zupoxiju.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/xafomum.pdfIn PDF document text
    • https://rapovesotupoma.weebly.com/uploads/1/3/4/3/134353038/wuwiwufazalaz.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/dalizifefukixenaga.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/bbf935c44711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5faa52af825e4.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/a72dbcf6-b679-4372-8904-fc9e666c8afa/68204864537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0c18b5-7ea9-4295-85a5-405ac31be6c4/skade_the_last_kingdom_actress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2133a399-476f-44c9-89e3-905b2f2e8bb5/vizomafoji.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/windwalker_monk_guide_8._2.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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 5092 bytes
SHA-256: 4c23d402d368e2601bf253e3b9fb639a3b19dc4645fcf1e741304469ebcd3d34
font_01_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 10464 bytes
SHA-256: 29b9d3a8834570ad7f41774dcea12a12a168495f5a050d250e5c8a713a66f018

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