Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0663b79684cea8d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 03:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 08ca554546c71d3ac310b9d6e9c081b2 SHA-1: be403cac3933bea610e25eec579652400dd0ec87 SHA-256: b0663b79684cea8d25b6dff7d7ee75b038dd6985d81cac224cb116e369d18212
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. While no scripts were explicitly extracted, the structure and embedded links suggest a phishing or malware distribution attempt, likely leveraging social engineering through the deceptive 'book review' context.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=the+one+thing+you+need+to+know+book+review In PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/gihu7gf/wuvarulivo.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/cER2jyS/air_hockey_game_at_walmart.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/8450095.pdfIn PDF document text
    • https://cdn.sqhk.co/wetaxawirewu/PgogeQw/crazy_shave_1._01.pdfIn PDF document text
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/a1dc1e760db900.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/eJJiigg/spiritual_warfare_meaning.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/6623642.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/FMhdjcQ/fixtures_for_liverpool_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/epHSX3n/kigodesofakuxiv.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/sezewu/lagu_camelia_malik_feat_rhoma_irama.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/74134958659.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/89528999333.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5072 bytes
SHA-256: c29d457e0bcb1b024f6190cd41f5d314d54a6ac6a4d9eaf439fc5a1ab9e37d57
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 11148 bytes
SHA-256: 2a61efae7468fe11b3719b8668e3f2c9adc038f7f482e7429cba89a4a2c2dfaf

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