Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08f0e86b1d57861…

MALICIOUS

PDF

82.5 KB Created: 2020-12-27 07:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 448acac7955689ce72fed74f40dcc572 SHA-1: 7a98f683ce729b7ca10d3b233cb48fd1ea652c11 SHA-256: a08f0e86b1d57861d460917f221f23b4f05d519d3291dbd684c47cfd34fb384b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a mass of external links. The primary malicious URL, 'https://traffnew.ru/aws?utm_term=python+beautifulsoup+tutorial+pdf', suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score point towards a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=python+beautifulsoup+tutorial+pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5fc06bac417ab.pdf
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fb3d52a1540e.pdf
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/borejimiw.pdf
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fd0898f8ba49.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/zapanexise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a5c319f-3e89-4d3f-9f78-63d9182d7ae7/63597378780.pdf
    • https://s3.amazonaws.com/viregujipowuru/10104142599.pdf
    • https://uploads.strikinglycdn.com/files/85a56020-edca-456a-a204-68b882abc8fb/launcher_3_apk_app_download.pdf
    • https://uploads.strikinglycdn.com/files/dd7602fe-3353-4ba3-8700-114f0848b2e9/fire_red_randomizer_download_gba.pdf
    • https://s3.amazonaws.com/bexolamabad/good_easy_minecraft_house_designs.pdf
    • https://uploads.strikinglycdn.com/files/00c51f28-caa7-44cc-93c8-d84abfe506f6/xupotoli.pdf
    • https://uploads.strikinglycdn.com/files/fef384aa-2b1b-4f5d-b4ea-fa5ed0edd592/34744906245.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_off000106bb.bin
272e8ddbdc31b1e9e5d619ff880055ca0fbb8f858883b59adf2cff18281344d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 5372 bytes
font_01_sfnt_off000118fe.bin
8c4f52ddf6d6668f53d2e14fe538f41dd1a5e58e5cdce221f928a1803991c6ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 10580 bytes