Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6567a170e2a31d5…

MALICIOUS

PDF

71.9 KB Created: 2021-03-18 23:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d9413352352f1af1ac042b07077aa36 SHA-1: 3eba83a7a8e15988451f05cd9d0dda7191f04c8f SHA-256: a6567a170e2a31d5bb6abeb0dbefb1c9a703247132bf8a3a952fa86052bdad53
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 link farms or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=wave+equation+worksheet+answer+key
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/5137943.pdf
    • http://ukranews.icu/gigunanexavatularedubif9x57c.pdf
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/keranegapipelal_tezikuja.pdf
    • http://deemonatrafik.xyz/37410402155tot2y.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/83286b2.pdf
    • http://rorixuge.iblogger.org/noralu.pdf
    • https://rufutegimojev.weebly.com/uploads/1/3/4/0/134040423/fbdd26cdbbd6ef.pdf
    • https://pesirirovozag.weebly.com/uploads/1/3/4/3/134316115/motokefokas-mimibakubozi-sasokos.pdf
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/tidakejibiwujowed.pdf
    • http://jibifiva.22web.org/97146358628.pdf
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/dajutol-fedorozilewuso-tivotij-nesejona.pdf
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/05e0e7c4ae820.pdf
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/5ef800a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_e022e491cdd94849a7e6fb75682bc30c.pdf?index=true
    • https://s3.amazonaws.com/nagev/damage_report_on_ship_example.pdf
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_d5930ef0b08c44c7af72b7e9c172ba8d.pdf?index=true
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_7ef896bb0fb04012b4b1ed7e0de0ec9f.pdf?index=true
    • https://s3.amazonaws.com/boduxatavepe/33085019962.pdf
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_c0c0ea33050541db806f859ae5ba0a49.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_36a65c9c4dc9433a85778c086f39823d.pdf?index=true
    • https://s3.amazonaws.com/bufexa/xoredevisevaxapam.pdf
    • https://s3.amazonaws.com/voropa/dijonoxodovezosekasini.pdf
    • https://s3.amazonaws.com/putelekireza/88644160963.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_off0000dcbd.bin
15caecd93800be27162e5f00a0552d43a09a10f1fd0f6ebde5947261659863d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 5196 bytes
font_01_sfnt_off0000ee89.bin
a1c302ee77ff30ed78729667a976dbe5d7c234ba6b420d2b0391cdb8d2acd908		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10444 bytes

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