Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca769a898b634c3…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 06:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc60aea9f2801ac7271fec7dca14aebf SHA-1: d4834f452f9ea46e3f159a5bbafaab211103f2fe SHA-256: 8ca769a898b634c31301cca5a118f69ae78c60e91cec4161b599bf359bc7b619
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. One of the embedded URLs, 'https://traffset.ru/123?utm_term=robin+williams+patch+adams+poem', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://traffset.ru/123?utm_term=robin+williams+patch+adams+poem
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/lomodamifox.pdf
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/zanav_ruwanutujo_sitazuxuz.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3b3b1fc-f660-4fc8-a258-be6deca8f552/81642429672.pdf
    • https://uploads.strikinglycdn.com/files/dd7d709a-52e5-4759-b160-7e7f76b6aa01/dowup.pdf
    • https://s3.amazonaws.com/kasuwevovog/activation_key_for_windows_8.1_pro_build_9600.pdf
    • https://s3.amazonaws.com/wegemebufojafak/mutumuf.pdf
    • https://s3.amazonaws.com/fokapikow/simawex.pdf
    • https://s3.amazonaws.com/labitajaxatufib/wunirirozaxojikoror.pdf
    • https://uploads.strikinglycdn.com/files/1917acf6-1692-476e-a06d-04717eba5f93/block_breaker_deluxe_2.pdf
    • https://uploads.strikinglycdn.com/files/7de2a0ad-df99-41ce-b0ed-38c30e535aee/sewulewojub.pdf
    • https://s3.amazonaws.com/fajonubinomeder/wearever_silver_brake_pads_review.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_off0000c8d3.bin
edf98037baac659e24a70db8e3ac4ed92f0cba20cfa954172b0d213863477edf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 5456 bytes
font_01_sfnt_off0000db4a.bin
581586f313a02d6a489860caba1ff20231164743569603a7f7707c1a0e4a0797
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10740 bytes