Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b20c09de52c4992…

MALICIOUS

PDF

68.4 KB Created: 2020-11-17 08:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a83cd11a26be73bcf658c7707380ca6c SHA-1: be6723e0d3c805aef6bc3365b980a49ab3d3c2cc SHA-256: 8b20c09de52c4992dd8dc8511744dcd1abb9e3f3908ad0e08be60db479455e8d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking PDF files, suggesting a link farm or redirection tactic. One prominent URL, 'https://trafffi.ru/123?utm_term=how+many+glasses+are+in+a+small+bottle+of+wine', is flagged as unknown reputation and likely serves as the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

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
  • 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.
  • 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://trafffi.ru/123?utm_term=how+many+glasses+are+in+a+small+bottle+of+wine PDF link annotation
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/zanexuponugagime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5fa0499ca9630.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/1737427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8a5c4c550fd.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/7ad79c1d-2de7-409b-87a8-2bef9fdd2bb7/26388760141.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/weathertech_floor_mats_440661.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/provo_zip_code_byu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/47740095802.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/80821575321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b99974-4b6f-405c-9575-d0879f08bd55/2937968629.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/tepepul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc7f513-6806-464e-8145-76a2c25b7c89/zajajukivarikisimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb081bf-0317-4381-83f7-b91eb70c6d59/gekibipasixugebevosatow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e1804c-08b8-49cc-bf3f-7e763d148d5c/wobufeniribatoxuxogip.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/80500431563.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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 5384 bytes
SHA-256: 9d0a06c4404b45f259eee0cbd0ef10d698497af006b21d08a7b77d92dc1e10e7
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10568 bytes
SHA-256: 5c5357c165fa86b82bc24be062d18ba6fa4694009efb242586ecfae3b4716751

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