Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb3e8c8f6ab6b6f…

MALICIOUS

PDF

65.3 KB Created: 2020-11-25 22:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5749d5a5dd9a933715f72429f46fb965 SHA-1: d636d36e487def1b376b7b6b1d12765aeacd509c SHA-256: dcb3e8c8f6ab6b6f37a0d8615156a18783aa7b6041387cce5a6871cac55166f3
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

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
  • 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://traffking.ru/123?utm_term=char+broil+oil+less+turkey+fryer+chicken+recipes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5f961afb676f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f9721ad5ebe2.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/9183548.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/cf43d5e5-3ee3-4ac3-97e6-6cb1ddeba622/nokipogawaveju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d213fd-70d9-4500-8b06-83e3565a1954/zaxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7466f73-020a-4d6c-adea-b1de01ea3223/allwood_outlet_homes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6a1e59-1a14-4590-9fc2-b5eb6923b044/xesededokesadamijobafijes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df63431a-e1d1-4f2e-80c2-6959508f6640/17732743097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9df2d6-61bd-44c7-b782-9cecf6479062/simufilutolutaxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdf0e52-ff8b-411b-99fa-a61943daa6be/angry_birds_star_wars_2_rebels_level_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f222de-d357-446d-850a-024be3e096ed/nba_youngboy_tour_dallas.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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 5316 bytes
SHA-256: 4a8bbbb7535b4a6888cea8c3376b9f0348f2ea13af25848f728f05c8205a21a0
font_01_sfnt_off0000c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 9628 bytes
SHA-256: db8a95f2474425179b90e494d40d993aa065695dc105bb802b68acc268bb422e
font_02_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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