Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7d153f265173fc…

MALICIOUS

PDF

70.6 KB Created: 2020-11-21 22:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a910b033698ec7f9ab2a713ba73b85a1 SHA-1: 71dd1856cc84d32e27ea57cc5e1b7ab2a99a5856 SHA-256: 4f7d153f265173fc9f3644bce0aeabd1998af1fd805d7b1fc86854ddf47802d5
156 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that appears to be a lure for song ringtones, which is a common phishing tactic. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a link farm or a method to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

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=all+song+music+ringtone
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/petutumu.pdf
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5f9bd3f7245ab.pdf
    • https://cdn-cms.f-static.net/uploads/4413454/normal_5f9474ce90eb9.pdf
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/muligito.pdf
    • https://kikuriniwabutip.weebly.com/uploads/1/3/4/4/134440093/fanoloraxal.pdf
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fb50c6335627.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8d2842db-985b-433a-81d2-bd725a3afae4/bawijigudu.pdf
    • https://uploads.strikinglycdn.com/files/d2b263e8-8ccb-43dc-b0c9-d19ccb4513b4/aerobask_eclipse_550.pdf
    • https://s3.amazonaws.com/nawuvud/91645065991.pdf
    • https://uploads.strikinglycdn.com/files/c4968e83-0f6b-46ea-bb52-59c30428ccbd/fetifogimozazewebali.pdf
    • https://uploads.strikinglycdn.com/files/4c88cbe4-f5fb-4313-a3f3-9d1ac2730616/ziwejavu.pdf
    • https://uploads.strikinglycdn.com/files/29672ece-d586-4236-8a15-f8f4cd93f1b7/nafasaw.pdf
    • https://uploads.strikinglycdn.com/files/a823945e-2396-4db0-b725-0759f1288459/youtube_tv_apk_firestick.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd2.bin
664847f67c8f5e06c34fffd0d339809f894ac4deac4b5ecc0c3ae636ec783173
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 4780 bytes
font_01_sfnt_off0000dbf4.bin
bd346c2df33139cb9b3dae70588153bbc1850b4760622b88a251ae1154789c04
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10340 bytes
font_02_sfnt_off0000ff4d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 4324 bytes