Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fab5ab76df13ae9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 12:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a742ff788d5e68b53fa54bdce55fb976 SHA-1: ffc50f82b8b9bf38b604504bd7304fc590bc5512 SHA-256: 9fab5ab76df13ae9ed68258cf64941bc27332c15a72fdc29408e477f28477dfb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://baarspo.ru/wix?keyword=maytag+bravos+mct+instruction+manual PDF link annotation
    • http://jaxotibovafel.iblogger.org/pisedik.pdfIn PDF document text
    • https://kisajevipog.weebly.com/uploads/1/3/2/8/132815123/nubupogagivofela.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/japavufe.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/1653952.pdfIn PDF document text
    • http://vifaborabab.22web.org/hollywood_movies_2014_free.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/87541605937.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/ultegra_di2_tt_groupset_price.pdfIn PDF document text
    • http://lojasamericanasbr.com/396445306268xrbo.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/nowefemoraxa-sarubuta.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/long_meadow_school_milton_keynes_ofsted_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wizidimawag/sonuzetujojim.pdfIn PDF document text
    • http://vukenebavez.rf.gd/identifying_linear_functions_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/biochemistry_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/kedosefefuwokagexifed.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/imsai_arasan_23_pulikesi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/30611528459.pdfIn PDF document text
    • http://molezadidusoser.rf.gd/sobenosu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5192 bytes
SHA-256: 103652ef9de9ee8f1950c29b141ed83ed0e47d5088cdf1360373c48acde846cd
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 10296 bytes
SHA-256: 67e5823eface0851bb18c7dd9bbdea1d5023c5371d465894cd7bb2bb17ef917d
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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