Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e97f83a09f65230…

MALICIOUS

PDF

74.6 KB Created: 2020-12-19 11:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ec3a18d1057161cb9d4c6cd5d4875a SHA-1: 54ed296043e94c99f2aefd454a527c69bf78e66d SHA-256: 3e97f83a09f652307ee67c46901282debc9507b759600f2c0c5a56a22ec3e119
196 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and a critical ClamAV detection indicating it is a phishing trojan. The presence of a password-protected archive lure suggests an attempt to conceal a malicious payload from initial scanning. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffine.ru/123?utm_term=link2sd+plus+apk+4.3.4
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f8767b7224b6.pdf
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/nibufiliz.pdf
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fb272f2e7a10.pdf
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fd3b78cc0ede.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fae54532b2f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fdd52f8c2d4633280e99069/t/5fdd9c820f6c913d44ddd021/1608359045167/72798846951.pdf
    • https://uploads.strikinglycdn.com/files/1c776af6-2cdf-4d2a-963d-e098e0c56de4/63834792717.pdf
    • https://uploads.strikinglycdn.com/files/5ad399c8-d895-4db2-9f67-3682b1fa803e/71519835896.pdf
    • https://static1.squarespace.com/static/5fc0e9e3bda9c57a97be47bf/t/5fc289763c02f22b9d5f26ea/1606584695622/super_singer_vote_result.pdf
    • https://static1.squarespace.com/static/5fc11e11ec917750a3d92ddd/t/5fcbb344a3bc3d191534c00b/1607185223269/grand_stickman_auto_v_mod_apk_download_uptodown.pdf
    • https://static1.squarespace.com/static/5fc51f2860f2895dc10325ef/t/5fd0aad98f1ddd5ccbe20224/1607510748503/wings_etc_fort_wayne_specials.pdf
    • https://static1.squarespace.com/static/5fce881f66456240515f431c/t/5fd6a6ce481cfa31add2b1c3/1607902926167/87331971557.pdf
    • https://uploads.strikinglycdn.com/files/1af065b3-2844-44a2-8ef7-7640b9b94275/24491545790.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d191.bin
e8295e316eef6e62599c94812ea7ea3a002967033a0ea1842ce1ee34a53f0d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5280 bytes
font_01_sfnt_off0000e3ae.bin
21684c64b2857c067a065000096ac51ca781120093b11935e538e193a20f3a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 10580 bytes
font_02_sfnt_off00010844.bin
18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 16144 bytes

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