Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd20522e41defce…

MALICIOUS

PDF

94.0 KB Created: 2021-04-07 04:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c2de4168255b3e149a2dc81d76fb0d5e SHA-1: 566ad4ce7fd9520473131cc7fd742c80b4bc0bd9 SHA-256: 3cd20522e41defcec55e1cf901a059a8861a9e4f1704333b727eeb43edb7c7f3
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the final malicious destination. The document body text is garbled, but the presence of a download button lure and numerous external URIs strongly suggests the intent is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.
  • 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://druttle.ru/strik?utm_term=mini+dvd+player+portable PDF link annotation
    • http://pivinavigabi.iblogger.org/corporations_act_australia_2020.pdfIn PDF document text
    • http://kilunanaged.iblogger.org/vugujilinuwobevaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fd66b7b5a742.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/gcFMQgi/wildscapes_mod_apk_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/Igclgdh/20720390369.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/BkRhcic/8676761016.pdfIn PDF document text
    • http://prizinsta.info/asimov_foundation_series_bookswakxl.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/jaLjhHG/lowercase_bubble_letters_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_606d015cd4796.pdfIn PDF document text
    • http://fenellalucynelle.info/41810550916l7yft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_602b711fc3b56.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/DjdTuie/63500353246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fd97381ec763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_4a5800625d8c4db596821690469b9076.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_eb96c5b92bd14ab1ac17a2eb1342623e.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_3fc22d5e9db549799bbb5cb1e83e91ef.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_8eca9e63817041a1a9dc9c74c93f96e9.pdf?index=trueIn PDF document text
    • http://vanaverusimox.rf.gd/29391847958.pdfIn PDF document text
    • http://vebojikabugoxa.rf.gd/us_army_ww2_uniform_patches.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_d732d28c310e4899b82628d819765c4c.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_609cde9856854eaaa659696e4a7f716c.pdf?index=trueIn PDF document text
    • http://bafigajunafolen.rf.gd/canon_eos_80d_manual.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_47232642f69249f0ba0fb1c4f088b8b7.pdf?index=trueIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_ffe3c0a933154f0b909a2e3c8ba72e7a.pdf?index=trueIn 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_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 5084 bytes
SHA-256: c3885b3c25fd6487871dc596a342542b98eb0b685459882c559cf4aaa7f7a3a6
font_01_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 12344 bytes
SHA-256: 09fcc50bb42d595e6e1c7cb8540c06c982556da8382bb1ff237616762d26f6c7

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