Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eac9b1fbd28bcb7…

MALICIOUS

PDF

83.9 KB Created: 2021-05-19 16:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52065bbeb23f6eaf0555d75ed04eaab0 SHA-1: 7e21cfc0dee7864d879dc2d64590c4c682c9c76b SHA-256: 9eac9b1fbd28bcb759e7659ff5d3c2be57e821844bcdaa223cb9f3ee85f88159
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malicious content distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://seumenha.ru/strik?utm_term=reference+letter+for+chevening+scholarship+example
    • https://cdn-cms.f-static.net/uploads/4473890/normal_6042f9c5ec831.pdf
    • https://cdn-cms.f-static.net/uploads/4476780/normal_603f0a4826e2d.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_6019d742a43f6.pdf
    • https://cdn-cms.f-static.net/uploads/4392451/normal_603b7ac4debbc.pdf
    • https://cdn-cms.f-static.net/uploads/4386354/normal_601b635757f51.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/bilut.pdf
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/c576bac5b1c.pdf
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/vasodusamikon_dapelo_desafokuziz.pdf
    • https://cdn-cms.f-static.net/uploads/4487197/normal_601422148b4a2.pdf
    • https://dugiwisevur.weebly.com/uploads/1/3/1/4/131437249/nemot_disufiti_tunategez.pdf
    • https://cdn-cms.f-static.net/uploads/4417319/normal_602a72bb55d52.pdf
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/16f85b6.pdf
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5feaef36f3389.pdf
    • https://cdn-cms.f-static.net/uploads/4485299/normal_606142e75eca5.pdf
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6019af81decc9.pdf
    • https://cdn-cms.f-static.net/uploads/4456663/normal_6054368b7b5e0.pdf
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/3037449.pdf
    • https://static.s123-cdn-static.com/uploads/4445331/normal_6004e5252048a.pdf
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/sasufuletapovor-pasujune-najiko.pdf
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/7569075.pdf
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/7018975.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff9124a8e71b.pdf
    • https://cdn-cms.f-static.net/uploads/4503387/normal_5fdb008b4c670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juzowilipi/how_to_check_driving_license_pass_date.pdf
    • https://s3.amazonaws.com/jeponowon/41234283710.pdf
    • https://s3.amazonaws.com/xovekolamoxe/cavernous_transformation_of_the_portal_vein_radiology.pdf
    • https://s3.amazonaws.com/jemisajoda/xowubamebupogafejir.pdf
    • https://s3.amazonaws.com/wofaxil/dumosavizibowexevikuno.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76b.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 6440 bytes
font_01_sfnt_off0001075f.bin
4eb8d8308b0fbf61d6ab6be4e12e56fe171f855f57e4a858865806331cc1b8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 5564 bytes
font_02_sfnt_off00011a40.bin
aba1920a837f76b741305bd2ca59c44d647ee4e86f5372fd6300b16c00745847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 11320 bytes

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