Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e47d19fc2ffe64…

MALICIOUS

PDF

68.7 KB Created: 2020-11-17 08:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5c8a58d2087bab10336654f2acef5ca4 SHA-1: 5718c1af261f7dde48df07b9cdf80fba101c94cf SHA-256: 61e47d19fc2ffe64111c1fcba6b01f2e85cbaad1bf900ccabd81ddbe9b61a2cc
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a "SE_DOWNLOAD_BUTTON" heuristic and numerous external links, including one to "traffset.ru", suggests a phishing or social engineering attack aimed at tricking the user into downloading further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the file's metadata.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=kung+fu+master+game+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8abf7f85d1a.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/parunajera_zexonekaxeru_makagigododi_nujolabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f92d7de20caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f9af289570ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_5fa9d853bf17e.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/jamokaroxoj/kamixexekegemugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9699b-3f6a-47d9-b0be-25a2bac90839/92202191860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423d9bba-e590-47f0-aadd-4b3f486d3826/tenogovakozekuroni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d8e110-d140-4d84-990f-9346493c5c69/69587058737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56685d0-1a0b-453e-96f4-115dd3e588af/35335843124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2058409-0655-4aa3-84b9-fea2ff1b8765/5296174906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46a7b47-d353-4818-955f-1bc3e5e8fcad/zeiss_contax_iia_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592b70e2-07f2-4d1f-bd0b-4f94345c1511/53346485487.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 5288 bytes
SHA-256: 0f2f45998d8bff3c677a54d42c938a8a1ca3dec0cf3d1e2e064d22c0cc5ef300
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10280 bytes
SHA-256: 13ba5a875984f2ada17aba2ebafa4bdecf1122f230f03fc74a1a23e23ae72948

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