Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b16f8bd3b3a267…

MALICIOUS

PDF

144.8 KB Created: 2021-03-14 17:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2542068667799572b039251da0aad3e SHA-1: 7c8cd4978e6054ba6bfc521bd06ce9f84d3a446e SHA-256: 57b16f8bd3b3a26781ff1979d1ab12d6ae021375e1150661064f0e9dde13f033
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, which is indicative of a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=celtic+heroes+druid+skill+guide
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/tudabofetugodoja.pdf
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/5624080.pdf
    • https://cdn.sqhk.co/kupovite/dyajfmA/7982654024.pdf
    • https://cdn.sqhk.co/lilaxikixo/jfjijhR/97915407832.pdf
    • https://cdn.sqhk.co/xozirijor/ifJgdTX/46010118000.pdf
    • https://cdn.sqhk.co/kunagukojoxu/ibhbTig/92817356480.pdf
    • https://cdn.sqhk.co/losiluja/rk7gjgf/vupovetazolefidiwulin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9cfa401e-42d7-47e8-8bd8-3eac51ecf1fd/how_long_do_chrysler_pacificas_last.pdf
    • https://uploads.strikinglycdn.com/files/82db66cb-73a5-4efd-961c-4b4969b3e447/punctuation_rules_and_practice.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_08169d9e497643afbb3e84118b7d259f.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_d7d55972bb7d44da9181025c651444d2.pdf?index=true
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_ca4d5613cd544a55a511a5f343e97f8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3d269099-bc67-4238-8f50-910a9be77135/how_to_set_xfinity_xr2_remote_to_tv.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_07013e6a92b9467f8b3ce473b13eba21.pdf?index=true
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_11c1ad015dd24639b96154a32ed5a2fb.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_off0001fc8e.bin
90c3875092c43ef7531757612e857ccddb1cac28b84aed3b882856212cd018c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC8E 4960 bytes
font_01_sfnt_off00020d62.bin
ea4cb7be99d810e0ef9843a738aa26cef4731d31ba8bd651c637455561d5ac59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20D62 11688 bytes

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