Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a7f494b2746e42…

MALICIOUS

PDF

72.5 KB Created: 2021-03-11 11:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fbf737c2ccb6f8d2f74bf57bd9a9dd2b SHA-1: 4ca6ab7044178aeffc8e13042bfd5b8112089f12 SHA-256: d0a7f494b2746e42f8e3bef849e205f0f3a1b2791a24291689dcccc14de44d22
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document may instruct users to install remote support tools, which is a high-risk activity in unsolicited documents. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://resalured.ru/wix?keyword=internet+scavenger+hunt+worksheet PDF link annotation
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/firuna_bokarivurosu_zinowudepomiga.pdfIn PDF document text
    • http://naturfresh.fun/how_to_use_an_automatic_bread_makerysmbz.pdfIn PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/5990869.pdfIn PDF document text
    • http://arnautmebel.ru/calisthenicmovement_level_1hf8i8.pdfIn PDF document text
    • http://oneitshop.info/protein_synthesis_in_prokaryotesp23i2.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/6519662.pdfIn PDF document text
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/pukajanupe.pdfIn PDF document text
    • http://taduzexemi.22web.org/black_ink_not_printing_hp_6968.pdfIn PDF document text
    • http://bestsalestoday.xyz/manaliz98eoi.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/extreme_car_driving_simulator_2020_mod_apkr2x71.pdfIn PDF document text
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/bigusinewudupiwavej.pdfIn PDF document text
    • http://takinodexitimax.22web.org/juduku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavipok.epizy.com/zetoxe.pdfIn PDF document text
    • http://rarisirifamawod.rf.gd/54713876007.pdfIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_150e282964444dc287f46b5c524045d9.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_3bb520ff06c84d3185cffefc72aafbce.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_dc52586dbd7746c09d9b6e7db9b91258.pdf?index=trueIn PDF document text
    • http://lewafozilit.epizy.com/juwuruvunufigana.pdfIn PDF document text
    • http://wixarebetiz.epizy.com/34489138238.pdfIn PDF document text
    • http://supewomok.epizy.com/les_miserables_musical_cast_history.pdfIn 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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 5180 bytes
SHA-256: 56b3adb5db327c655c6494fc17d856604822ae78e47c85976d668fd3a7af1e13
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 10428 bytes
SHA-256: 53f4a2a16d33bf6f2fdcaebe623ed625b01378c532de413274432cbd2f2f96b4