Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c0446999d3a6d6…

MALICIOUS

PDF

103.6 KB Created: 2021-06-01 17:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5719a27983495cb5d4adae301134c30 SHA-1: da688bbf55a088b306067f917d5549780f1d82c8 SHA-256: b3c0446999d3a6d6bae073d45c9f428ffbc0d2b3233de2ab001d6ffe762a350d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to attract traffic. The primary URL points to a page discussing Samsung phone issues, suggesting a phishing or scam lure. ClamAV and ML classifiers also identified this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=why+is+my+samsung+s7+not+turning+on
    • https://cdn-cms.f-static.net/uploads/4418000/normal_603969da2baa6.pdf
    • https://cdn-cms.f-static.net/uploads/4413004/normal_60144a382f7a7.pdf
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5ff2e0d2af91d.pdf
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5fd8c2f51d9aa.pdf
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/6190134.pdf
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5fe2dca1e5829.pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_60532af89f601.pdf
    • https://zefipoxiba.weebly.com/uploads/1/3/2/6/132681281/gomezata.pdf
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/jurolemu-xobowafetob.pdf
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff0bdf3554cd.pdf
    • https://static.s123-cdn-static-d.com/uploads/4469836/normal_60b5a43b85fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd3ab676cc0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38089fc8-651b-4534-8a65-a65e4119f0d7/73835903307.pdf
    • https://uploads.strikinglycdn.com/files/41278c1a-f449-4ba6-abb6-101181a08999/kuravuv.pdf
    • https://uploads.strikinglycdn.com/files/4bea4004-bb7d-4243-82b4-e58ebba5fd64/what_are_the_3_types_of_listening.pdf
    • http://xojifot.pbworks.com/f/taylor_fundamentals_of_nursing_9th_edition_ebook.pdf
    • https://uploads.strikinglycdn.com/files/1d51c03b-cc31-46e7-bd2a-52d1c17f747e/similes_in_the_great_gatsby_chapter_4.pdf
    • https://uploads.strikinglycdn.com/files/994a2b95-65c4-48dd-8604-3f4fdb0b87bb/79759911973.pdf
    • http://refarumiba.pbworks.com/f/majirojuwuzek.pdf
    • https://uploads.strikinglycdn.com/files/524b913c-ee77-4339-890d-26cd239e994b/83107726284.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c26.bin
23f528de16e2a42509ba0f40e6c766125d6622d5bb87ba612eee98d842b7de11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C26 5264 bytes
font_01_sfnt_off00016dfb.bin
7d672fffe03c3712cfdc74d41be4e8acaa0588c5c77eaf7c485844f1ed1ee99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DFB 11044 bytes

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