Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee7a0948b599701…

MALICIOUS

PDF

100.4 KB Created: 2021-04-04 14:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bdff79732f0ccd38c57602df8f8a2743 SHA-1: ba8d4c377ce1f8076b79562c946fc5303025806d SHA-256: dee7a0948b599701ca6ef38d383df90aad12c2ea85f1de82e537adaf6fc2b047
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=nematodes+book+pdf PDF link annotation
    • https://cdn.sqhk.co/ruxuvedije/tjgigid/zagugewanegox.pdfIn PDF document text
    • https://ruzamoga.weebly.com/uploads/1/3/4/7/134761687/21493700698037f.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/punib-felumozur.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/5710a660132a.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/sutorivi-dariwesenoku-pakupifoli-genadorafof.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/50fc3c.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/hghh5gh/68751287401.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/eb9de85dc8762.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/zenovowuwaxika.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/3352538.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/tCjikjj/45128844727.pdfIn PDF document text
    • http://anyita.space/431993790962zrx5.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/ibjePMv/blacksmith_merge_idle_rpg_hacked_apk.pdfIn PDF document text
    • http://wei-nmvc.com/cisco_ise_2._4_license_ordering_guidefzah8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotafonapajawut.epizy.com/90740534091.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_a487e082f0c844a69a5a7df96d7e0ee4.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_6dad789e704f4606a38783bab5c169a4.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_4138b0d5d616470fac6616b3a2825b22.pdf?index=trueIn PDF document text
    • http://nozaleb.rf.gd/solid_principles_c.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_b61acd848f8e482a91991334227a5a2d.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_f09e44c4c3074fdda7474ab3c67ae8b5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7E 5232 bytes
SHA-256: 135393d1d66b261d6071d5b15e055f88fa973154f313e487bcd0b7c4553ef990
font_01_sfnt_off00015e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3F 11628 bytes
SHA-256: 1233e6a8e16eb0e41896332fd79b732a19e62b94e2af59330575ff1781892b95