Malicious PDF — malware analysis report

Static analysis result for SHA-256 842464bc22e0e6c8…

MALICIOUS

PDF

67.8 KB Created: 2020-11-25 22:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9cd585d61f2c0293365153e1a084b0c1 SHA-1: bc8c83077800b6d037a2c5eb0534dea129d640b2 SHA-256: 842464bc22e0e6c87ea5b9bad0e2788043fe1af71863ea3d820f74ca6a0e4254
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with one notable URL pointing to 'trafffi.ru', suggesting a potential phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may contain embedded malicious JavaScript or exploit code designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafffi.ru/strik?utm_term=blackweb+shower+speaker+manual PDF link annotation
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/6e7ef2b1eb.pdfIn PDF document text
    • https://sopakefexije.weebly.com/uploads/1/3/4/3/134398413/9f3513d9d2d2d6.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/db168975-8aca-40ad-aaef-b70d1599581c/vinutasewekesade.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/amulet_book_2_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/tipupegunujeridelon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fa1995-fc7a-4cb0-adbd-0b24f8431764/wuwoxezobudiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/15152534877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ec40cf-7ca7-4c08-aa3e-c3801067df0b/schaum_series_linear_algebra_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831fb54f-b87d-4e39-8bd5-ed3e1951a335/335701377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76de54e-7d7f-403b-bbe1-7f727c52c606/linear_algebra_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ca4e37-109c-4335-b5d3-46e66882f4b1/clojure_for_the_brave_and_true_download.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_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 5516 bytes
SHA-256: 0fa267422655cf6c5ef37a563269ec1edcc72e5e707d666f89f24207a7a96a24
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10196 bytes
SHA-256: a5d11fc79482a25c217e61cde2d7128704d5f8e31e0c461cd523fca428dccce9

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