Malicious PDF — malware analysis report

Static analysis result for SHA-256 3523bf611612ce4f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-07 06:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 95dc7bb69f7e0c28c46a31cc6112d024 SHA-1: 3cad94d7c029c1a1a990e5a826a0a15a317374ff SHA-256: 3523bf611612ce4f8029fa43015e345ddd0cfd75eeaf99c7660da42b33c7ea59
246 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for credential phishing. It contains a link farm with numerous external URLs, many hosted on disposable domains, designed to redirect users to malicious content. The ClamAV detection and brand impersonation heuristic further support its classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/bazimurubavabusofuwi.pdf.
  • 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/strik?utm_term=ok+driver%2527s+license+real+id PDF link annotation
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/bazimurubavabusofuwi.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/9443892.pdfIn PDF document text
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/573c2a51.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/e8690.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/RBn7PhZ/jevek.pdfIn PDF document text
    • https://nukukenodaxuw.weebly.com/uploads/1/3/1/3/131384044/6e54d.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/b4e32d52470.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/riwojin.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/last_child_in_the_woods_summary_by_chapter.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/jchifjh/10719360135.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/6549771.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/gdhcJXS/flow_free_bridges_mod_apk.pdfIn PDF document text
    • https://mamubata.weebly.com/uploads/1/3/4/5/134598765/lexokaruv.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/tegugutaxunufanajijul.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/4ihExD4/hang_line_graphic_design.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/surifif.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/153460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/xamedojupufufugilofik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8af0c35-8948-4a48-8068-fa7544375da5/how_to_cancel_lumin_subscription.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60354646-8c57-425d-ad5a-d451318c53ea/geremab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa8003b-dc94-42ff-8709-db2e72b5bb4f/lokade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d709be1-0593-4fbf-802e-4154dc8ed940/mastering_the_art_of_french_cooking_original_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ee4078-3e7c-4da9-b431-8bdf4f878da9/kindle_keyboard_case_with_light.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_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 5116 bytes
SHA-256: b54d5e1388c649e64fb3039c15afb7558936874270182db2975ae636bcb39964
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 10944 bytes
SHA-256: 1696cd2f598bec6b4516eaf2652a5bf7900733d87be023a609e1b20875a10e45