Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf35920cbb2ad2d…

MALICIOUS

PDF

83.5 KB Created: 2021-03-10 16:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8daf51e035b955817ef625703e842525 SHA-1: 6867566d4f6c010b69113559ef026f4ea83e1e02 SHA-256: adf35920cbb2ad2d360e2bcef6702cfffaac0654ae1a2e13a213f9de63e75ac4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDF documents, some hosted on disposable domains. This suggests a tactic to manipulate search engine results or to distribute further malicious content to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=google+chrome+website+als+pdf+speichern PDF link annotation
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/vuwilupol.pdfIn PDF document text
    • https://falizuzu.weebly.com/uploads/1/3/4/5/134506804/nediraboxowo-lerakuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_60099aca68b21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367301/normal_60062aa153eba.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/356685.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/fE68gcq/know_information_collocation.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/ezhgowt/xijogufodozaguvulapegixeb.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/c2376bff.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/letijakeb.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/cb92cf3ddb450.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/0987d56f249c.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/iMa17F2/32057103269.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/0534e717b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_603432fb2cb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_6019a213a4f05.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/hj9icRq/rise_of_skywalker_emperor_palpatine_scene.pdfIn PDF document text
    • https://xetinize.weebly.com/uploads/1/3/2/6/132695894/6319857.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/a975c.pdfIn PDF document text
    • https://fegoluxojelab.weebly.com/uploads/1/3/4/4/134490239/jekopifop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_42ab81a430d44a18ba26ab05f2b72078.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_dbfb55b8050344dca666eefbcaa42bea.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_7cd155bbb3ea4951a3fb8f87deb3ab43.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_5f735190a1d04430853557ff2acf1668.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 3352 bytes
SHA-256: b70882b8fd4253cd7c22e051a160f368e052dee56201b744ccf335e0bea06c39
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 5832 bytes
SHA-256: 2f85c6a9692a4ed3666c69fddfae06b88986a5a52e49c0d540f64ab67b12ce3a
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 11356 bytes
SHA-256: 4dea2c6ee48680e15d8992ff4b3ffb7358ca07a5e0fb20aaf6a129d8fcba205e