Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f7d4e82d7f71b8…

MALICIOUS

PDF

66.4 KB Created: 2020-12-20 13:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6131413bace7efb804b01a2a17a5b3d3 SHA-1: 12afc89ea97357311ac6d719d842c6c3c201f35c SHA-256: f7f7d4e82d7f71b887fb2707d2c93a9d8ec36d03162b3ccccf279726285f33ef
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to marketing and derived demand, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=derived+demand+examples+marketing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5f9a3e6cf02ae.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/3589321.pdfIn PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/lemizuguretowa-xexaraledumam.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/2fccdc32-82e0-407a-81ec-a3c0c9ff575b/what_measure_reflects_the_difference_between_current_assets_and_current_liabilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ddd064-86b9-4746-8145-94cb1b6607ba/dugexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0143ca81-348b-4061-b86d-555c962e4a1a/je_m_abandonne_hillsong_partition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc195ac6b97992eb560ddc3/t/5fcbef3d1415195da094af14/1607200573997/15406230655.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/all_sorting_algorithms_in_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3edb8c5-68a8-4360-93cb-2ba7542b84ad/15456755195.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_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 5468 bytes
SHA-256: a97522777edd0039fea5b3c02eb1b320a2f8d52324b094171ebcf37cf0380a32
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 10724 bytes
SHA-256: 6f41aa5eae804eb61552716f292aab42f30f7d9fd1a2c6974d30b3d4034f9c00

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