Malicious PDF — malware analysis report

Static analysis result for SHA-256 9accbd881b41efa7…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c919f43f4af9d0d5ceaa36763d9dabe SHA-1: 2e95e21d4f3548d162cdcd0f4c0a0d176f4ecc5d SHA-256: 9accbd881b41efa7592d910fc07fd38e3dfea4afa6405fad50232e39923cf53d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detections strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=how+to+reset+check+engine+light+chevy+silverado+2011
    • https://zomatofaso.weebly.com/uploads/1/3/4/6/134633851/1926608.pdf
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/da1c862892b25.pdf
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fca328a8f9a5.pdf
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/diretakepodu-numet-zaramiluzap.pdf
    • https://fobamenowukar.weebly.com/uploads/1/3/4/4/134485242/7342701.pdf
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/c1a073d8664.pdf
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/3466294.pdf
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/7497256.pdf
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/4146882434.pdf
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/tijosugetuwaze_sasoluro_buvopibudinidig.pdf
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/jugusepuvoke.pdf
    • http://mereritijazos.scienceontheweb.net/agricultural_economics_project_topics.pdf
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/3595815.pdf
    • http://sidufapas.mywebcommunity.org/83627818832.pdf
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/5960101.pdf
    • http://vataponuxizeliz.mywebcommunity.org/12414649644.pdf
    • https://cdn-cms.f-static.net/uploads/4416149/normal_603bed300fb84.pdf
    • https://wowumufugijakig.weebly.com/uploads/1/3/0/9/130969685/7049677.pdf
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/padetefosanone-tomedezuwodom-zijizeri-gojupel.pdf
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/7119a54bea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_d2cd13e8850d4c7fac2af9a59d0d192d.pdf?index=true
    • http://jeximojela.myartsonline.com/asme_b16._9_2020.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_99873da5fa11450db4a294f939d9fe5d.pdf?index=true
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_d8de0d31ecbc45f9a5ac74f795acf824.pdf?index=true
    • http://sekuwomexapa.myartsonline.com/mubaxofomukov.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_570d8d3754f7401288824af5a64e9e58.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_94996cc2ff744da79110ebb8a90980dc.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_off0000f34a.bin
3b9d3fc92ef592fa40628e3b1914ee77bce8d6f7bc5eea054f33f908c2e285aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5804 bytes
font_01_sfnt_off00010729.bin
f4f059562127fb88b3238b5f177c09055874cfd9c0728f0cf8dc1967bdd91275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 10388 bytes

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