Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6620253beac286…

MALICIOUS

PDF

78.4 KB Created: 2021-02-21 10:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 232a9c821d143d5f4ff314377e617718 SHA-1: 7b4764be0d80b73ea90e110f3da132e7514bdbbc SHA-256: 2d6620253beac2864973bb62332578d5a4ed72ee8a0d642e7402a66e6b06e9bf
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links pointing to various disposable hosting services. This pattern is commonly used to distribute phishing content or redirect users to sites hosting malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=all+my+sons+notes+pdf PDF link annotation
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/zedadanab.pdfIn PDF document text
    • https://fesomexipilajuj.weebly.com/uploads/1/3/3/9/133997099/111970.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/67687ad4a80a.pdfIn PDF document text
    • http://gejodumegemato.22web.org/70858936300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_6006c932f0831.pdfIn PDF document text
    • https://vusugurubem.weebly.com/uploads/1/3/0/9/130969976/takij_nixom_kebofakanow_bodapixigemubi.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/7031802.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/milusirudug-vefavo-rakazu-nowavaxuze.pdfIn PDF document text
    • https://xamoguxa.weebly.com/uploads/1/3/0/8/130874300/mepakizinimevur_donabufuvatul_gaviwakul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_602c27b4959bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fcdff1ba6e72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_6004143358f6b.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/vavovijaxovava.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/gdRw1oP/t-_mobile_customer_service_number_hours.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/56119424162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/34967629421.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/free_ytd_profit_and_loss_statement_template.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_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 4972 bytes
SHA-256: c7deb89542e6849e134c5520902106bb2a530105d8404ec4fb031ea61baa5c69
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10900 bytes
SHA-256: ce9fc80a49d9bd31f3aab7494d3acd66034766dc4c130282c4e376c53f9e06ab

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