Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f47ed560a99f3…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 19:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea820ddb77c1a1dba5df12c7237e79fe SHA-1: 7ba89071608dda8f5d14ce1e373eb7af52358ade SHA-256: a39f47ed560a99f35b79278ad3a1cfec96d09e62e42c1fa6ff84ea11610a37da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=east+asia+geography+worksheets
    • https://static.s123-cdn-static.com/uploads/4366321/normal_6005cd7909c38.pdf
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/bezil.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fd8c2ecf1733.pdf
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/0ecb614.pdf
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/sozezufivepajufogep.pdf
    • http://mediaverifiedbadge.com/the_elder_scrolls_v_skyrim_special_edition_collectors_strategy_guideg5os7.pdf
    • http://ultra0.space/lidubowajodesuom9cz.pdf
    • http://astropsychology.website/crossfire_hurricane_rolling_stones_online0gqm4.pdf
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/muwurodami.pdf
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/516c385711c9a32.pdf
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fe6eead0d3e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_292fbb4388ea46cf9ec6d8e0835e2ba6.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_31fe775581df4ee08819f1c9b029050c.pdf?index=true
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_c2745a0c522c41a6b7595307f39fdc4e.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_7a9bab66a4424ff59c530695837a8ca9.pdf?index=true
    • https://s3.amazonaws.com/dogevazapiwediw/higher_secondary_result_2016_marksheet.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ee234154a2ab4f7ab33a2db6e13f1423.pdf?index=true
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_845f995a830947fc8bf8fe9bd97c9c21.pdf?index=true
    • https://s3.amazonaws.com/pukaridimupo/joviziluzizipifigixi.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_74266aeacf7f4836b69d1ea25c76f319.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_6b379ef0c43e41f79ade7bd267cb37e9.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_094918391ada4daaa6d7ff849cdb63e2.pdf?index=true
    • https://s3.amazonaws.com/liguwubore/agneepath_full_movie_1990_filmywap.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe0.bin
d723e637882a7720f12d7b28690d0892b9c122ad96b09fa9999ee132cf965171		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5264 bytes
font_01_sfnt_off000101e0.bin
ff197741dcda72e709fdc869b60edca76e86935f036aca7b3594599689c43ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 10952 bytes

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