Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb995041d387677c…

MALICIOUS

PDF

63.1 KB Created: 2020-11-20 00:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9795777994bacb8a1c524eeb5af632cf SHA-1: b5745a9cda61b5d6224c5dfb502551aa79182982 SHA-256: bb995041d387677c0e08f6ab093676913f231ba49705e355b1e9b0e2cbd760cb
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 flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body contains a suspicious message and an embedded URL pointing to 'traffset.ru', which is likely part of a phishing or malware distribution scheme. The presence of numerous external links, including one to 'uploads.strikinglycdn.com', suggests a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=don%2527t+click+the+red+button+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fa6f89c7bd79.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/nepen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f91d4f420395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8753f73ce44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f966accbada4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5faf1541062a2.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/1f9b4bef89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fb5e1ade04cc.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/0b783f68-cef3-471e-a08a-517bb1a203d5/etoile_a_8_branche.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09780e30-4b49-4d49-842a-d682e3c682d2/tixesugolana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1cf4b1-5d8f-4ea7-9a81-c3d3bce27466/50820263918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452be489-3693-4d4e-b786-067981074888/whale_worksheets_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a034f46d-62ea-4714-aeaf-fea82f1a5f67/72653965069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a538106-7c53-40a4-9bcc-6248d42ed15e/zuzuwozafekutu.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_off0000b965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB965 4876 bytes
SHA-256: e74e777f6eafd396fa12e4c617ac91fce4cedc70d12b3e65a99075eb39171281
font_01_sfnt_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 10628 bytes
SHA-256: 6ce60e8d01e5e6872a3c885849dd89614ff47fc6233649267c023f77c2b6c56a

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