Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2fb5c635b055a1…

MALICIOUS

PDF

84.8 KB Created: 2020-12-24 19:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b5d9645d06e9a55d0b33981a52fcf5 SHA-1: 77b48a9d8ead4110a7554f57a04c86e7cc863987 SHA-256: 0c2fb5c635b055a10a851fb06b28040fa979c1e671d3c39a4c7dddf42bb5c7d1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic identifying it as a malicious redirector link farm. One of the primary URLs points to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=cheat+india+songs++ming
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5fbf87e370bcc.pdf
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5f9947a8e5308.pdf
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/naponekejaviguz.pdf
    • https://cdn-cms.f-static.net/uploads/4468819/normal_5fd634d5ee449.pdf
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fabdc4eaa8d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f32bdbc-4186-46a6-b231-61e35b53e6db/kubevaroforizelapoja.pdf
    • https://uploads.strikinglycdn.com/files/a509bb3b-b0de-4f1d-aa88-2669ff33cbe0/70461668455.pdf
    • https://uploads.strikinglycdn.com/files/a5b5a707-3621-4ea7-abc4-a7146cf30833/grand_canyon_animals_that_live_there.pdf
    • https://s3.amazonaws.com/banula/uk_radio_online_apk_download.pdf
    • https://s3.amazonaws.com/pilazi/linusi.pdf
    • https://uploads.strikinglycdn.com/files/ae684326-ce1a-4d95-8156-eef5e4c2de3a/mechassault_pc_download.pdf
    • https://s3.amazonaws.com/navoburarovada/phn_mm_unikey_toolkit.pdf
    • https://uploads.strikinglycdn.com/files/4fa9b24f-e4c1-4a79-b432-3ae2d9dda3b9/xinulek.pdf
    • https://s3.amazonaws.com/fonibinaraj/apa_format_citation_multiple_authors_in_text.pdf
    • https://uploads.strikinglycdn.com/files/3d9c8fd8-83d7-42d9-b654-c768215f2eac/area_perimeter_compound_shapes_worksheet.pdf
    • https://s3.amazonaws.com/nokiva/dajijiporix.pdf
    • https://uploads.strikinglycdn.com/files/86bf8149-bab3-4b48-b8dd-b6ee02c54d5e/armageddon_apk_mod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa0.bin
52887f16bfd9aa6c3a4a7f76683b2002937a8824658639b626c5e26b5944843c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 5016 bytes
font_01_sfnt_off00012085.bin
14e6093181da503c39106a48f254e61298e067628c0b66c10cd883e21f2c1843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 11180 bytes

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