Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf5694cbbe6fd78…

MALICIOUS

PDF

65.9 KB Created: 2020-11-21 10:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 41407c8fc2643b9bf7ed9bf661abf256 SHA-1: d7b2e4f6fd6ec3140c1d82a974e9c1d9a7912ac8 SHA-256: 8cf5694cbbe6fd789bd30f75fc5d257c2f1ceaedd4a7b25435c139430b7f88f3
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=grilled+shrimp+tacos+recipe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fafd1c2da0b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_5fa1690bd191c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8dcf692e073.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/ziriguvuwidekom_teniwakukani_maxidi_vurokonagig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5fa8ac19e26e5.pdfIn PDF document text
    • https://pilovezodono.weebly.com/uploads/1/3/4/3/134313857/31177e241be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f992ab90195c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f87716600b0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/29843318399.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/fivimisewopajunakurakepak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7d1908-a9ca-4662-873b-71034083db7a/fopubodevaxavusarizelome.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/hornady_reloading_manual_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/pump_design_handbook.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_off0000c3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CE 5344 bytes
SHA-256: ccc92ee06f81e01cd402c567bb7bb2d8375dc87996557e7d0889de08b8bf8994
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10980 bytes
SHA-256: c021258245c543015021fbac46b4555e41afb0d88f71a9b025070eb37fc90a8e

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