Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71ce51b984a57d1…

MALICIOUS

PDF

58.5 KB Created: 2020-11-13 06:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: abca1343387f916c6a17d1a8e813cd8e SHA-1: 7177000ba2435cfbe356b5154d05f88c0d07c557 SHA-256: d71ce51b984a57d118a9b4180bd603380a7a4efc550a450007683a272bea8833
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://trafftec.ru/aws?utm_term=rule+1100+gph+bilge+pump+manual' and 'https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/db05d7b.pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=rule+1100+gph+bilge+pump+manual PDF link annotation
    • https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/db05d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449185/normal_5f9f5934712a0.pdfIn PDF document text
    • https://jilanuma.weebly.com/uploads/1/3/4/5/134522828/9469939.pdfIn PDF document text
    • https://figuzenage.weebly.com/uploads/1/3/4/4/134472600/399f81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5f962ab5eefe1.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/548c7.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/bd0febe3-a49b-4085-99a6-b60537fda9dd/dragon_ball_z_shin_budokai_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65e9142-b68a-4b05-9c8e-32699123b09a/40113813941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73cdb42-9b99-447a-9620-b7a0beb34c3e/45040869937.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/zanuvuzemulugitikif.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/pance_prep_pearls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027b98bd-2f01-4c0f-bdbc-9c0d92bcb4e7/91343278989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c9e347-621c-4843-88e9-22cbb93d2003/dogs_with_brown_noses.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_off0000a8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A1 5300 bytes
SHA-256: bba4d8c4ef7d8bf61778f8c0f8c7fe7d536e4cd663a8eef1f76ef8486f7ee41f
font_01_sfnt_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 9792 bytes
SHA-256: bc037a63f8fcd67e08cb5d5ed22e0032bb7ee8a4b5cca63c93027a89c37cfd3b

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