Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5af93412d132c5…

MALICIOUS

PDF

84.7 KB Created: 2021-03-18 06:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a3b26c13d991a37753939efd72000c1 SHA-1: 81ea3ef277f0a07ff4f66a2eac146c36ef6443a2 SHA-256: 1b5af93412d132c538b0c67f7e89487d02baa735a89e746fd7685aef87176407
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, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/strik?utm_term=do+you+oil+a+kitchenaid+mixer PDF link annotation
    • http://kagaromorin.medianewsonline.com/85159551608.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/pizogujikapibixoful.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/h81m-p33_audio_driver.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/51502736485.pdfIn PDF document text
    • http://tehnikator.ru/tissot_1853_prs_516_price_in_indiax69c0.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/sokuka.pdfIn PDF document text
    • http://gatorama.site/nikon_coolpix_l330_accessories0la5j.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/68346847873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_7f21a5d5a1744bda9b7cab1bf46c5059.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_a42a9355ecf04fd19bf4173dbfc14481.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_e1d651f07cb5429693e01075a9850e40.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_849a15789063416aab016d3e4252d6c0.pdf?index=trueIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_c907ad2fa25c4b878fa88d0c06827a39.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_f20a3a451d754b91b8d7dc8497ba6445.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_ee34461be1c14c9cbd3ee7ffe6c7f2cb.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_a3b6483782094aeea326ef1a620fe183.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_fb240256115f4b35a729634d0a59b27f.pdf?index=trueIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/pasizema.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_cd41baae1ae342fa832e9c8a306c9a7f.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_79ba82a940fa467f8d03eb00ce1200a7.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_351170b0743b4ffd8054fd0f76e729c6.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_c280293bf0034f5dbf21d5bd611cd4f0.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_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 5236 bytes
SHA-256: dc28b56b8c938025ce4b8dbbf18a4bf8f7f2bddf8157c32045f97e7db2695dcf
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 12120 bytes
SHA-256: 9004a164d72c7b2f595d0ddde2eef8bfe1ed0413d3d8543d38a15b969098d94f