Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4d7cda0b2e3ea2…

MALICIOUS

PDF

82.3 KB Created: 2021-03-21 10:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2d566182f5771f446614e14d76815c37 SHA-1: 70960aee56b95f1bc5440cf8b716d8319348c0c8 SHA-256: 7b4d7cda0b2e3ea21e2ef3c358ead62f8c417393f33f96a9e67532e5848add2e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'free sap basis training material pdf'. No scripts were extracted from this sample, but the presence of numerous external links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=free+sap+basis+training+material+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fd3c1b6aea5e.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/pewukovi.pdfIn PDF document text
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/6f706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5ff8bca3673e8.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/aiag_spc_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_60122da84a2ac.pdfIn PDF document text
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/vovazogojatom_gebelujarafuw.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/73051364165.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/girejafagojixuvi.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/counterfort_retaining_wall_solved_problems.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/jivala/xenimagugokup.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/why_is_my_samsung_dryer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/bhairavi_movie_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/dyson_dc59_battery_life.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/age_of_sigmar_changes.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/who_are_the_new_actors_in_season_3_of_the_crown.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/42824492309.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/casio_f91w_strap_india.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/segiwewedibererotijetofe.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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 5456 bytes
SHA-256: b02140c16ef8beeb19da8cefbdb6169a27acd9f5d28436d11f44073a0378ba4d
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 10860 bytes
SHA-256: 0a35be3b20b2bbe19009257cf5aef45e487162bd2b417e988a0f1b94219e244b

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