Malicious PDF — malware analysis report

Static analysis result for SHA-256 796824c482bccb28…

MALICIOUS

PDF

82.6 KB Created: 2021-03-17 13:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dcb8363a864a520b52a1dece78d67e0e SHA-1: 37f0e53343a219cc5b151d47b35addf6df4367ec SHA-256: 796824c482bccb28ec747f541a33a6e00cf420465153e065fa776fc996e7e52d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://resalured.ru/strik?utm_term=percy+jackson+%2526+the+olympians+the+lightning+thief+star+cast PDF link annotation
    • http://khareedforosh.com/sasepamoxubakesebosunixeaqzmx.pdfIn PDF document text
    • https://cdn.sqhk.co/volakase/Yjfhegg/53221245069.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/nunupukojanigvofo8.pdfIn PDF document text
    • http://tronreserve.online/barem66gct.pdfIn PDF document text
    • https://cdn.sqhk.co/foxenikap/ciikrjg/android_17_voice_actor_japanese.pdfIn PDF document text
    • http://idealica-italiaoficial.site/zonegikojumofejubadiwutuno928.pdfIn PDF document text
    • http://canonsburglake.org/ubuntu_usb_drivee89xn.pdfIn PDF document text
    • http://service-hire.com/bofowewugilolaridojuzobi2erl1.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/eiefnzi/83762266317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6012260ae2fff.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/zituwugizano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5fe25287b185d.pdfIn PDF document text
    • http://fogatevemawe.22web.org/guruzerabivufil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478952/normal_60302cde3a931.pdfIn PDF document text
    • http://sdl-trade.com/kumijosesumeriwese5abtf.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/nudubi.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/BORibig/11152801948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b9a770-bf9a-4532-9523-4ce9bf94dba3/all-clad_6.5-quart_slow_cooker_with_ceramic_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e68459-60a0-44a9-8671-93932ead202a/bupovuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3b659e-25b2-4ece-9dae-c66e28e53076/starting_a_baking_business_at_home.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_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 5004 bytes
SHA-256: 33e92c3c1809d51b9fe9d56ab9d75fc90dbb98a5f78b16d04d54e4cc8afc4894
font_01_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 11028 bytes
SHA-256: 3c6184696190f56b06b0145ac0e80a3bcb1cd55be269229389921a29aed86e67

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