Malicious PDF — malware analysis report

Static analysis result for SHA-256 6916e5dab759e8a4…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 08:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 937f2aef346d0d2b2bf06d583d8c87a6 SHA-1: aa907dcd5551fb523c0d64f2f496356a708503fc SHA-256: 6916e5dab759e8a4b761910fed402e3839fcc662011df71f15401c32fc50dacf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/wix?keyword=citizen+eco+drive+radio+controlled+user+manual PDF link annotation
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/e39ea1c28.pdfIn PDF document text
    • http://creditscoreusa.info/kibinikefiloburuel6bq.pdfIn PDF document text
    • http://lojasamericanasbr.com/how_to_get_good_at_figure_drawingwuvtg.pdfIn PDF document text
    • http://tertov.xyz/75244190512fsnv8.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/hm96sPL/call_of_duty_zombies_apkpure.pdfIn PDF document text
    • http://golosa-spasibo.ru/bjp4_self-check_4.1_logicaltestsmv6ob.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/duwuduriduw.pdfIn PDF document text
    • http://airned.ru/nirogururiraroloxuznuu8w.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/Lpsgfy1/barbershop_2002_kevin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0867c2-9716-4850-a305-f3b06f284604/fupidiv.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/18158358162.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_c5164fe4533a4f39b6ed55680071bef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/311f4e78-6d61-4251-adf7-2f55cf55d52c/what_does_the_name_mackie_mean.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_98a6ca38f982414e8dfeb5ad3065e008.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_d92f2646fcf940d084ac8ec82223936c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38c42f2-0e40-4a35-ad7e-ac54980b7b04/63378541527.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/dispersion_brushes_for_photoshop_cc_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5100 bytes
SHA-256: f8639aa5419fe471c3ab28589f4697a05f26d97c139645074927944dbdb1a037
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 11640 bytes
SHA-256: 313c1ff0b43cb67b05c787d5ea95a48ebdc79804bd595d38c9a8477d5f6cb52b

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