Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aa30cb485d8b03…

MALICIOUS

PDF

78.1 KB Created: 2020-12-03 23:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ca1e28e7d0f4463b739e455d351e7dd SHA-1: 5bf3bcfc8f6e7aa53e844426534a024537951f4f SHA-256: a6aa30cb485d8b0386f92c8d3fd4e7360cfec18c28a9d3a82de37a5731bc94cf
214 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, with a critical heuristic firing indicating it's a link farm pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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://cctraff.ru/aws?utm_term=basic+information+about+indian+culture In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fad13f38f671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8c14a331510.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/fagazovama_nebajikoro_likipasobapup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f8c38f6af37b.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/0abe83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f97cb604fe3b.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/d01d821e-5824-4433-9cf5-7714cfa0653d/sudaxonifumodimutezizok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69ac350-a743-4373-bb27-795c34ea2c51/remote_sensing_of_the_environment_an_earth_resource_perspective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29a133f-d4a8-491a-9e09-3120bc82dfb2/movexariso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc4f8d2-4497-4565-b3b2-97c792c0fca3/pamonitajisojite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaa0d7b-ddd4-4042-84c6-6f33d5ac62d4/ripeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b041e8b-cf58-44d0-abcc-99a64b5d6289/29160496389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c71803-dacc-4f0e-859e-7541fbe7c359/mousse_de_lave-vaisselle_qui_sort.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/tituze.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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5356 bytes
SHA-256: 4608ce6a5a6173ec5e757409e4cfe03c3d82cf3410de0e8586708bf88d0d6409
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 10232 bytes
SHA-256: 5002ae001a5b180dbed465c6c223e37046e80d6f08c59c7b8f10b0a948565cf0

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