Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6865b4f263b0df…

MALICIOUS

PDF

88.0 KB Created: 2021-04-02 09:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21261383b8c8135dfd177607a051eeaf SHA-1: 8bce1c77185bb6095b81a80a68546f6c405da275 SHA-256: bf6865b4f263b0dfe9e8164597b8f5396c5ce384c0363de1f913242f60bce8d5
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of numerous links, including a disposable link farm, suggests an attempt to redirect users to malicious sites for downloading further payloads or engaging in phishing. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://pelibifir.ru/wix?keyword=power+of+the+psalms+by+anna+riva+pdf+download
    • http://cashbackk.site/gigunomutov2gsqg.pdf
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/96a0a4e426a8.pdf
    • http://reduslim-shop.site/free_full_nancy_drew_games_onlinepxyou.pdf
    • http://nadahul.ru/negapajajidokepupulok7xciy.pdf
    • http://mikrotikwizard.com/cuantos_tipo_de_derechos_humanos_haye85zg.pdf
    • http://suvuxivenorum.mypressonline.com/what_do_you_get_when_you_cross_a_hunting_dog_with_a_telephone.pdf
    • http://forkidsshop.online/naradubutuwoributowaromasyc1bv.pdf
    • http://kafidovomiguvo.mywebcommunity.org/6436119140.pdf
    • https://fufudexun.weebly.com/uploads/1/3/5/3/135317209/4111971.pdf
    • http://bometaximom.scienceontheweb.net/nfhs_basketball_rules_2020.pdf
    • https://fetevosave.weebly.com/uploads/1/3/1/4/131438058/wegatuno-jujokebagusevu.pdf
    • http://effektzhizni.ru/629100436371g7s2.pdf
    • http://livemavuxedu.getenjoyment.net/verizon_internet_router_support.pdf
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/gofijatipimavixasa.pdf
    • http://bewewafip.scienceontheweb.net/nibez.pdf
    • http://xibawolafubiz.getenjoyment.net/diary_of_a_wimpy_kid_deep_end_ebook.pdf
    • http://cardioactiveuficiale.site/27827659853dvum0.pdf
    • http://nesarose.sportsontheweb.net/76532458984.pdf
    • http://portkamesto.site/device_care_apk_downloadz331p.pdf
    • http://help-bluebadgecustomer.com/627978905387k7rm.pdf
    • http://bcpzonasegurape2-viabcp.com/kabipaletavakuux560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f1f46a0-05c4-4658-9d22-15cc5cb578eb/tabla_periodica_de_los_elementos_para_imprimir.pdf
    • http://sawurawefivovo.myartsonline.com/32048265306.pdf
    • http://zugepoguj.onlinewebshop.net/cucurbitaceae_family.pdf
    • https://uploads.strikinglycdn.com/files/b2838d4a-8157-4350-b7a2-10a585bf1b1a/miniature_dachshund_puppies_in_ohio.pdf
    • https://uploads.strikinglycdn.com/files/3f42eb98-1aed-40ef-bbc8-8180a4a9d4d4/20045956487.pdf
    • https://uploads.strikinglycdn.com/files/4bfa867d-b9d6-49cb-becc-e70054973e83/que_significa_decir_como_agua_para_chocolate.pdf
    • 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_off0001119d.bin
ea66234ef42846760919d019119e06ce3758af9850a318587c396ac569ed6baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 5676 bytes
font_01_sfnt_off000124d6.bin
ddb0abe953e93d3d96cc55c08a58d045fd3f8deeea1045edd791bf038a412003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 13288 bytes

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