Malicious PDF — malware analysis report

Static analysis result for SHA-256 04509518820e96a0…

MALICIOUS

PDF

77.1 KB Created: 2020-12-19 13:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bede997fcfd9bc9472b01dda21aeddab SHA-1: a64a088d520e5cc71e4d85953be7a344573a477b SHA-256: 04509518820e96a03a36ffa15b4ac5370278d45ee3fdd41c6c9a95cccbfed440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one pointing to 'https://trafftec.ru/123?utm_term=sse+alternate+start', suggesting a link farm or phishing attempt. The PDF structure and the presence of numerous external links indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=sse+alternate+start
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/jejuroletadodufana.pdf
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5fa94d1e1eba1.pdf
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/6877299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezutu/55239285208.pdf
    • https://static1.squarespace.com/static/5fc3c939bd14ff0dd2ae97c9/t/5fc515da1972c46e3c3ef953/1606751707368/72925861884.pdf
    • https://s3.amazonaws.com/gasodamuza/rusozamizolibef.pdf
    • https://static1.squarespace.com/static/5fc77f0702915d4a16f8d210/t/5fcf14a87c36362741a7c681/1607406761377/word_jumble_cheat_machine.pdf
    • https://static1.squarespace.com/static/5fdd37888094fd3ccf307d49/t/5fdd563c91828d0f5d2d5d8d/1608341053533/printable_dc_metro_map.pdf
    • https://static1.squarespace.com/static/5fdd391cd610986319751208/t/5fdd808e6a6ad7222f0305bd/1608351887380/38301606622.pdf
    • https://s3.amazonaws.com/xupimaral/79012584421.pdf
    • https://s3.amazonaws.com/povodijirig/zamonavudoduvegitejovojop.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_off0000f2a3.bin
cc8a4e27db62ddba929659efb5561615ea3b7de42c3b43d66a8409bf373dba86
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 4784 bytes
font_01_sfnt_off000102ea.bin
ed8dbfd86b29077b6223fb34550b4172ef87567cd7ca835a84cf4db7fde43050
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10840 bytes