Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb47deecebe249…

MALICIOUS

PDF

78.7 KB Created: 2021-05-24 23:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e8078d6b4c87639b5a18a604c41c1b5 SHA-1: 2ed111bd5ad3a8c9855bc9f9ba253a89470bdd5e SHA-256: a0fb47deecebe249f8bdfc3076aadf2be456c7e73b61b3e2dbf9c3bdaf945e8d
214 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, likely intended to phish users or deliver malware. The heuristic firings indicate the PDF is designed as a link farm, directing users to numerous external PDF documents, many of which are likely malicious. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+mirror+my+android+to+my+vizio+smart+tv In PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/gofeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fe741e5c2c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603844c4c67d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_60530fffaf16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_600d98cd4c5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_6040a20e9acee.pdfIn PDF document text
    • https://ribiridoxa.weebly.com/uploads/1/3/0/8/130874248/4681652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fd94c8c933ff.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/4292896.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/7827214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_6041af2d38dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fd117ea273f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_605593a71c6f9.pdfIn PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/julik_julogog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_601e82a852494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/74ebe7a4-b447-4eb8-a7f0-57446928b1c4/siwifawub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8769129-c55b-4a14-a14e-83870104cd78/biblical_meaning_of_number_604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d189607-4826-4598-99a9-b352da67bbac/sozer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bade7060-d620-427e-9d67-9931a16b9f43/penovedirefa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 4876 bytes
SHA-256: 20e4c2e6b6236b76b39858b058d29e37ba6a9e42299866d5b7ac61d82a735e0d
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 11232 bytes
SHA-256: 008f15894abee1beda3ba19f30a89d12f1962675be24186a3acacabc0f64344c
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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