Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b02d0490dff89…

MALICIOUS

PDF

66.7 KB Created: 2021-03-25 06:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c106dd25cd1375a1ce2f273aab63d5 SHA-1: 19d830179a54fe04599a7c81f5c16da48379ac3b SHA-256: f29b02d0490dff899bbb285fdb15a0624e6213e57588a3326d07b5813a5cf531
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous URLs points towards the document's primary function of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jacksth.ru/wix?keyword=closet+doubler+uk
    • http://bodaweziwov.mypressonline.com/assurance_automobile_en_rdc.pdf
    • https://cdn.sqhk.co/tamupoto/jehctid/change_microsoft_authenticator_to_new_phone_office_365.pdf
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/3226339.pdf
    • https://kafunuxuvivupar.weebly.com/uploads/1/3/5/3/135303333/3809436.pdf
    • https://cdn.sqhk.co/sipobufiw/jM3Xjjw/67740300420.pdf
    • https://cdn.sqhk.co/dilizilozok/d7vXjgM/58548314289.pdf
    • http://kijofizovurisos.medianewsonline.com/tidulorobis.pdf
    • https://cdn.sqhk.co/pulovafafita/ighgsjQ/nasa_news_asteroid_29_april.pdf
    • http://folugomobok.getenjoyment.net/lojixogusosinik.pdf
    • https://wuwonemuv.weebly.com/uploads/1/3/4/5/134589345/xizawatiwubodepowiji.pdf
    • http://zukoretevir.medianewsonline.com/bcom_1st_year_books_in_tamil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_505efd41380b4164b674c7b869229925.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_be8f8fcf7ae04d0598e87a6de2613da1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4cfb3e9c-53d6-4175-9a13-ab484bbf5d30/21212862737.pdf
    • https://uploads.strikinglycdn.com/files/02eff404-a655-4f5b-9efd-ae8f49036cd4/kizadanoxopezaxid.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_d3a453f897ee40a8a5d1529368e69cc0.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_b2f1705169544311882e80fbfac99a35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df0095e8-71bc-4f22-9b3b-d5d7bfa6d822/canon_pixma_mx922_ink_price.pdf
    • https://uploads.strikinglycdn.com/files/900a45c2-30b3-4d99-aaa2-3a768c8bb042/three_major_theories_of_motivation_in_psychology.pdf
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_999d6f9c36474074af05ef14e03ff406.pdf?index=true
    • 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_off0000ca68.bin
f0019dac9f50e495aab436d46395ce2427f6d0d7f45d962573dcdf83fbf0b1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 4716 bytes
font_01_sfnt_off0000da75.bin
e1f30d2092e3a32c9823492e0c9bf5bd13611f19c949523da202f43bfed54349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 10436 bytes

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