Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e79cf1be405fce…

MALICIOUS

PDF

74.4 KB Created: 2020-11-23 08:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40b470e1b909fa774c9eeb8b601b445b SHA-1: 565fbb19f6ed4d3651e8ac103f31af8437c387b1 SHA-256: 94e79cf1be405fce5a52a05d0fab0900f1e635654fdc87cdc62444564c795677
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links points towards an attempt to redirect users to potentially malicious sites, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=padre+pio+council+knights+columbus
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/4083450.pdf
    • https://cdn-cms.f-static.net/uploads/4450350/normal_5fa46f41c1a37.pdf
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f99ae9bee7d4.pdf
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/eecc1.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/22555.pdf
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f93c79d3ae24.pdf
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fb31dd01c529.pdf
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5f9c80415ea34.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5f92fb6e2dba6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fuwawibu/potentiometer_arduino_code.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/video_camera_editing_software_free.pdf
    • https://uploads.strikinglycdn.com/files/bff75007-d36d-4b20-b7a6-4711bb35d03f/68110583464.pdf
    • https://uploads.strikinglycdn.com/files/f19cb330-40d2-495b-9ebd-2daf3f4cfeba/nosaguvimus.pdf
    • https://s3.amazonaws.com/radaruropivoje/benito_martinez_elementary_uniforms.pdf
    • https://s3.amazonaws.com/viromibukoleliw/isd_196_greenleaf_elementary_school.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96f.bin
ffdfe0f21fa200acb48a4553590035ba410c32075594b7719fbccfef4aadb956		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 3208 bytes
font_01_sfnt_off0000d4df.bin
453341958465802b1d4826771e8a1f355d0c3421b71c2826c5dd45e45d7a7d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 5572 bytes
font_02_sfnt_off0000e797.bin
82f3330a8144b905192c6e98f43ef4be980a681b9fe144ccd4da9d421b319d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 11340 bytes
font_03_sfnt_off00010e23.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 4324 bytes

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