Malicious PDF — malware analysis report

Static analysis result for SHA-256 55330a4592eaecf8…

MALICIOUS

PDF

68.0 KB Created: 2020-12-29 16:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b725c7d83f6e4d50baa2150f050eca SHA-1: 54b926f37d28218b59bed80332264c13b7cbb0dc SHA-256: 55330a4592eaecf8f8f3e083d36288d967ac461e56b9865f915efd8a6d57db41
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest the document is designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

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://trafficel.ru/123?utm_term=gigaware+usb+to+serial+adapter+driver
    • https://puperoriwob.weebly.com/uploads/1/3/4/7/134715375/wokanu.pdf
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/jowidazowaxugutifug.pdf
    • https://roresino.weebly.com/uploads/1/3/4/3/134364893/xubafesu.pdf
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/bazujesifodolij.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/1d4dd57d322.pdf
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5f94e1f948f8f.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5feaed9e12b4f.pdf
    • https://zanagolebiwom.weebly.com/uploads/1/3/4/9/134900312/xuzepafiz_midisapekonaz_wubamixakowas_rubokuwojedoko.pdf
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/4675862.pdf
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/navugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sowewazulejewi/77130338279.pdf
    • https://uploads.strikinglycdn.com/files/8d8b3e1b-f3d7-472f-b10c-bd47e6cd72ad/quavo_huncho_album_zip.pdf
    • https://s3.amazonaws.com/viregujipowuru/setopemewazositaza.pdf
    • https://s3.amazonaws.com/retobifulipo/eular_guidelines_gout_2016.pdf
    • https://s3.amazonaws.com/jevuxozazebazug/google_maps_api_add_layer.pdf
    • https://uploads.strikinglycdn.com/files/3cafa4b7-100a-40c2-b60e-f50a43e1553d/gods_creative_power_charles_capps.pdf
    • https://s3.amazonaws.com/gavobawum/88404281665.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_off0000cb36.bin
c2d7abbe8c575f7d9e0a05e50cb8b3ce3a045694284d7eb43f07c3fe924b6a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 5452 bytes
font_01_sfnt_off0000dde8.bin
8ed7778c7af810bb74f7ba448f148452b65ccedc0af16f8b156aff435203eafe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 10816 bytes