Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86ddffff7f4e438…

MALICIOUS

PDF

71.6 KB Created: 2021-02-18 17:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8edc2db592b9e8fd5b9f0efda9a74e3d SHA-1: 7e45772cd68f1a30d7f9e1135cff0d335398ac60 SHA-256: d86ddffff7f4e4389a150c9b675faca5513be0ec20cd847b979bff18e3d8acbf
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. The primary external URI points to a URL that includes a search query, indicating a potential phishing or scam lure. ClamAV and ML classifiers also flagged this file as malicious, specifically 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://seumenha.ru/strik?utm_term=does+brandy+melville+have+free+shipping+on+black+friday
    • https://cdn-cms.f-static.net/uploads/4444370/normal_601d125ea8f03.pdf
    • https://cdn.sqhk.co/jisaside/aSPgcWE/nanoxupamemebemafex.pdf
    • http://kiwirixup.22web.org/29601522298.pdf
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5fff07daf0c0d.pdf
    • https://tifavuloxu.weebly.com/uploads/1/3/0/7/130776439/tariruxanexu.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_600f4ebccfc81.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/149b2800.pdf
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/rifepas.pdf
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fcf47775da4d.pdf
    • https://cdn-cms.f-static.net/uploads/4470826/normal_60179dcf81ab8.pdf
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/dd56fec993eb.pdf
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6018b8b2c332a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kinabufosusipa.epizy.com/19628251419.pdf
    • http://giduzorim.epizy.com/msbte_model_answer_paper_22101.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_off0000d8a6.bin
4dfb7046d3876e9443b07fafe7b106650c4fa6d0bffee9654035cc012c2bf3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 5932 bytes
font_01_sfnt_off0000ecc7.bin
b2d5c96737f5aef12d7f160e93184623ea60e1969ac00825f4cac4080e6d1b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10536 bytes