Malicious PDF — malware analysis report

Static analysis result for SHA-256 784c96e0ee163d1f…

MALICIOUS

PDF

92.1 KB Created: 2021-03-22 15:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d9d449cee1178590c0374d1f490290c SHA-1: 2a402e58ed287c7cb82b411a285db57ff292e589 SHA-256: 784c96e0ee163d1f87e2a44c52f87daa9afb9d5a2629f576cfd59e0b17b52db0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to other PDF documents, suggesting it functions as a link farm. One of the primary URLs, 'https://ponafet.ru/wix?keyword=pretentious+game+unblocked+google+sites', appears to be a lure for search engine optimization or to direct users to potentially harmful content. The presence of numerous external links and the overall structure strongly suggest an attempt to manipulate search results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=pretentious+game+unblocked+google+sites PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370528/normal_6024ba1b6cb12.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/tufib_mirerozonovij_tobibadedufow_pifozosibepepiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fd64cc46f50d.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/0ec042d4f9d5.pdfIn PDF document text
    • https://dupomosukafe.weebly.com/uploads/1/3/5/3/135387566/lomawokazilumirom.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/8f9c3f.pdfIn PDF document text
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/c42200bb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_f0250d7ea5094a0d86bfc582d92aa0aa.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_962a8dd39b2f4cfeb3753d0a28b66bbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8da3ff-0fd1-42fb-98d2-4e4c2ca5137a/dd_beyond_coupon_2020.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_f815e282b2314c11b891ab6959b5f609.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/557b8e48-a1d7-4c5c-8a32-6fb004cd68b1/the_blue_book_of_grammar_and_punctuation_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e915eef2-ce5a-4272-a576-9a76aacfd270/how_to_replace_battery_liftmaster_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d439a9ef-7f88-45e0-aae1-aa598485df99/48415006588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075e18b6-89e3-4d22-b2b3-b9f13412a4cb/who_is_fearless_fosdick.pdfIn PDF document text
    • http://gedikoti.epizy.com/31232554111.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_8916ab032cb14e54b62e2b65f31cf99f.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_323958166ff24a73b40e4c533d83638c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ca5532-a375-4a70-afc1-da1eb216500b/dugonuvaze.pdfIn PDF document text
    • http://zosutifajo.rf.gd/atrial_fibrillation_esc_guidelines_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503c7467-61fa-4198-93a8-f8ea19b06fe8/zaxepalibomaxuwimovopafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1948761-a533-4554-9d92-0d55274eae38/kukri_knife_fighting_techniques.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_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 5464 bytes
SHA-256: 146ed933f49c55cb7e62ee3f912ce8225f8f29451d5d4796c0ea680fb43e3c4a
font_01_sfnt_off00013b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 11604 bytes
SHA-256: f589424de7b5cd1ac4642800f5c7224fdb8878db7bb0b3e988432d01ffa3a3dc

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