Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b026b8deaf1f8f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 00:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7591bc365ac91330d4ecf4be49ad0af SHA-1: ddbb2d095d7e7b9005917796c5486b9258c56848 SHA-256: f5b026b8deaf1f8f2d5030cc8952138d4688c1fdcc65cd06dadff605197a2819
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, appears to be related to movie songs and downloads, a common social engineering tactic. No scripts were extracted, but the PDF structure itself facilitated the inclusion of numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=bestwap+in+zid+movie+song
    • https://cdn-cms.f-static.net/uploads/4484154/normal_5fdbecab62a63.pdf
    • https://static.s123-cdn-static.com/uploads/4495034/normal_5ffcb7ed8250c.pdf
    • https://cdn.sqhk.co/tezakagadol/jdQYLmP/army_gd_admit_card_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_600fe7a664ab2.pdf
    • https://cdn.sqhk.co/mimufedu/fsvcig3/aws_billing_reports_s3_policy.pdf
    • https://cdn.sqhk.co/tajiwikiter/jhgcolk/latest_hollywood_action_movies_2018_free_download.pdf
    • https://cdn.sqhk.co/xexogataza/iutiaG4/pet_shop_boys_it_s_a_sin.pdf
    • https://cdn.sqhk.co/fegibidizog/cgfibmq/diced_tomatoes_can_walmart.pdf
    • http://faxusigeroles.sportsontheweb.net/63698642192.pdf
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fe72988aec1a.pdf
    • http://zinefikitozozeg.sportsontheweb.net/sulananan.pdf
    • https://cdn.sqhk.co/fotenulutis/hdgchiw/48922938547.pdf
    • https://cdn-cms.f-static.net/uploads/4416510/normal_6012244577d2b.pdf
    • https://cdn.sqhk.co/lixipadiwel/tg08jdc/wibevetemijowuluzekaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_b2123431bbc34d5eb842cf9f8883c61a.pdf?index=true
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_08cda823641d4e4c8b67c7a6eee891cb.pdf?index=true
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_ad9eacde3b6e4f729e47ac0947d72cdc.pdf?index=true
    • http://wolobugoxew.myartsonline.com/how_does_augustus_waters_die_in_the_book.pdf
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_47679072e73f47e498f9d487a8f26b78.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_fd68018fff304a0986bf7ef27cebad0c.pdf?index=true
    • 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_off0000ed65.bin
4f6c6f7847bfc9fa7ad8778978e13a5456834eccaba583e590d6011f421109d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5400 bytes
font_01_sfnt_off0000ffde.bin
3171f93478fa096a375bd124dece8f753e626357b5199a0da6c17bc9b5585db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10704 bytes

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