Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f6bb42c8f3f7fd…

MALICIOUS

PDF

79.5 KB Created: 2020-11-25 15:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fcd90bc1b095ae99cf8b3d84b6fc6574 SHA-1: 07f06ff90cbfc3dba45449538da014091b2369c1 SHA-256: 79f6bb42c8f3f7fd521fd5a7d21acbb0cc2344f749fb6fef7135fb81fb12e0de
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 and an ML classifier, indicating it is likely a phishing or spam document. It contains a link to a redirector, which in turn leads to a link farm of 26 other PDFs, suggesting a coordinated effort to distribute content or manipulate search engine results. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a malicious intent to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=toyota+22re+motor+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5f9dd4b66670f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5f9fd6d2ae803.pdfIn PDF document text
    • https://gibeduxobiwutu.weebly.com/uploads/1/3/4/7/134752611/lubobetesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fa66059521ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_5fb7eab69e114.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/ruxalikedeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5faaefdd2e09d.pdfIn PDF document text
    • http://www.opentle.orgIn 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/bc94846d-9ae1-4625-a36e-f6b1bbfdf1a0/68510687601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c1b800-d2ce-4c2f-a104-ba4e0755d3e7/22298882740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3ad8d2-5d67-40ac-bf08-6f1e4e4fe0e7/33943604113.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/53507398275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1133f90e-8dac-469e-b2cd-e315966e306d/clive_barker_s_jericho_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083206f5-5abd-4185-bfd3-ec522c32713c/lopesesubivudunukibimuw.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e153.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE153 14756 bytes
SHA-256: ccfc5c4e579320cbef7d3ff29802a3cf59e772fd3490e6be85efc534ac5dd46f
font_00_sfnt_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 5116 bytes
SHA-256: 30b2f39af997eaa9cc03c34a6b44470709e9877c85df0421253f19d60a7a3a4b
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10936 bytes
SHA-256: dc8af2102f8c10cee26003b3b9a15b9cb9609306015db87b2e621cbc0e1df5e8

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