Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3982503510647f6…

MALICIOUS

PDF

83.1 KB Created: 2021-03-14 04:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a09fda035acbc5ed2b5086a549d6a27f SHA-1: 510a7298dc09f2ff62b3ec5ce594556f19e9dd25 SHA-256: c3982503510647f6483b03395a84f99d52c0fc0893d7ef4dfb12838bf0eab660
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via the linked content.

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://lozipotod.ru/wix?keyword=my+boy+premium+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417990/normal_6039fab1916df.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/are_combination_washer_dryers_good.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/surviving_sepsis_2020_guidelines.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_much_money_do_nfl_players_make_if_they_win_the_super_bowl.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/46408272276.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/all_the_bright_places_netflix_summary.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/74094798234.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/sifotapidolekadezew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_603f6aa1787c0.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/cf620a4c-1bd2-4ffb-8a32-5976673925dd/16366437927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e180c01-c157-429c-8ddf-de59da276f0f/64988965575.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4e96677dde4743b1b4164d0a6266ee29.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_37c6d92f51fd44a9a953b71252feb77a.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_af4e38fddd8f46f680e2343bd0320644.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7212c568-f47a-4d75-af94-397f70d2e45d/8295940082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640eb862-3c61-4b10-9387-857f9cadb71f/zerokedituguva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada522c0-a180-4557-ac03-72242d4aa28e/bose_cinemate_remote_reset.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_5d743a8fe5cd45f8ac2a9586cc810d6c.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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 5064 bytes
SHA-256: 7ceedcd96b3e99cf606c91b7cbf8c1cfe8c0750ed8ecbca61e698b7690e62f7a
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 17432 bytes
SHA-256: 6051283b53236996f192c91dd4c5297a2dc10251af00a86b194db5ef13e88c84

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