Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24c889497c1cb9…

MALICIOUS

PDF

77.4 KB Created: 2021-01-11 08:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 75d201dd9d48c1cfc1786ea31d2d9b50 SHA-1: 7b3e654815cbc5dfc14e5f7cae8067a97b1f36ef SHA-256: 8a24c889497c1cb999e44242f5ab9092621a18d1e431ce12c6d0fad80f8a0999
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or spam content, likely leveraging a client-side exploit or social engineering.

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://traffnew.ru/aws?utm_term=incident+report+abandoning+post PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417045/normal_5fb2d24ae34b5.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/hdgggf9/hidden_city_hidden_object_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gK3Ihbb/last_island_of_survival_new_map_update.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/ZXQCf9b/10970026920.pdfIn PDF document text
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/5ec68ef063edfc.pdfIn PDF document text
    • https://sanulatoz.weebly.com/uploads/1/3/4/1/134131282/86ce7f5b4.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/ibjfNhc/jelly_filled_shortbread_cookies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5fb8416146e49.pdfIn PDF document text
    • https://dulexarupiwaju.weebly.com/uploads/1/3/3/9/133986428/silikof_magutuwufu_fofetojom_xutiw.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/4952be5046ff5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530937/normal_5fcd8f6bd21e0.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/6136984.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/pjibGjf/chonky_boi_cat_chart.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/firigugixujotov/olx_ph_sta_fe_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/kozixudevute.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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 5288 bytes
SHA-256: da2867178c3f0d4774164f5a157949753b4b461dde0814142d0f3084671429c0
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 1700 bytes
SHA-256: 40d6f0d14115c8799969c1017324553caafa713c3f24dfc1eb18a61cfdf36a58
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10780 bytes
SHA-256: 6edef66ed0114c018533e947391958e753fd3c7a065b10225bcd8db6c0bce26b

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