Malicious PDF — malware analysis report

Static analysis result for SHA-256 7801dc81e82d31eb…

MALICIOUS

PDF

41.2 KB Created: 2020-04-02 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 93f55f7818591d85ffc20062055a2787 SHA-1: 7525c08a4f7a8faace3d0f2de9a6fad2b2bb3c25 SHA-256: 7801dc81e82d31eb1edd9a30cb9e60f867a9c15771b8d891eca13ee4eca74aa4
116 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, suggesting a link farm or phishing attempt. The document body, though partially obfuscated, includes a reference to a novel and the authoring application, potentially as a lure. The presence of many external links and the ML classifier's high confidence indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://swcounselingexam.com/uploads/1/3/0/7/130740571/130740571.html#the+cursed+child+novel
    • http://zirma.com/uploads/1/3/0/2/130272571/viziroxatowupopu.pdf
    • http://randiandmike.com/uploads/1/3/0/2/130291712/guvajanatiwud.pdf
    • http://thewellseasonedwoman.com/uploads/1/3/0/5/130541004/tudojotugexonefux.pdf
    • http://avdeco.be/uploads/1/3/0/2/130292179/2025288.pdf
    • http://ryokukouen.com/uploads/1/3/0/5/130590432/bidit-xuxurerimunagi.pdf
    • http://broabusiness.com/uploads/1/3/0/5/130539021/738636.pdf
    • http://notastelikehome.net/uploads/1/3/0/5/130588627/2794196.pdf
    • http://condoinbiloxi.rentals/uploads/1/3/0/6/130639419/4396554.pdf
    • http://homeinspectionsolutions-mt.com/uploads/1/3/0/6/130640066/somavemazoxudogitu.pdf
    • http://thehistorichartingtonhotel.com/uploads/1/3/0/9/130969634/7d3903c754.pdf
    • http://greensmoothies.eu/uploads/1/3/0/2/130271259/jifuxumekufupu.pdf
    • http://freeconome.com/uploads/1/3/0/2/130291555/dffc95c2a.pdf
    • http://nationaltrafficsolutioninc.com/uploads/1/3/0/5/130552016/5371312.pdf
    • http://oppacostarica.com/uploads/1/3/0/4/130489081/4b695.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000781a.bin
384a699aa0d3dc58c2e539d6a18ac2774f620f5b619805819faa0bae5aec526a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781A 8300 bytes

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