Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4e3854c779e538…

MALICIOUS

PDF

66.8 KB Created: 2020-11-23 13:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61c723bcf740d813c6c5152101c5fcb5 SHA-1: 165159c52f9c4895ac8d07f879d196bc0d29a740 SHA-256: cc4e3854c779e5389020771fa6e43ab9d7d7045ee0fb4e6b7d6dfd0e1247d1ec
176 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating an attempt to direct users to multiple external resources. One of the primary URLs, 'https://traffset.ru/aws?utm_term=acid+bases+and+ph+worksheet+answers', is associated with a phishing lure. The presence of PRC/3D content and a high ML classifier score further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=acid+bases+and+ph+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f92a5766b71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_5fab6750beaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fb87aef165bf.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/3109600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fb58b9d527e1.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/felasorarabipis/volume_of_3d_shapes_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc86e697-ad7a-4cad-822e-8f374a0c0a42/writing_tools_roy_peter_clark_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfaf7572-5098-4932-addc-d5ee21c5cb8d/mazubutil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d50e23-4687-4526-986c-c3be4b09035e/giwufojakiruginodo.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/kikawuge.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/australia_visa_biometric_information_in_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/automatic_door_bell_with_object_detection.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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 5416 bytes
SHA-256: d194beba81a11ba0ee3cbcc7b67fe43c22a4241888aaf3c7c1c381d7cd48e381
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10000 bytes
SHA-256: 1abad84a69c5860a4790dc948c14e13ccbdbd2efb555f1159e1bf38df76523bd

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