Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cdb0a039586c70…

MALICIOUS

PDF

78.9 KB Created: 2021-04-27 17:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: af5aafffe5445e692918fa7802ff5eb8 SHA-1: 711edb2e4739be6b11b3b799b93a0899afed0731 SHA-256: d0cdb0a039586c70529312543007e47cb16962d3d48a9128b1fa902b8d9a16a9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. One of the primary URLs, 'https://gimoguvi.ru/strik?utm_term=is+this+the+coldest+winter', appears to be a redirector. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure points to a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=is+this+the+coldest+winter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388285/normal_6061e01685bee.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/konosuba_volume_10_synopsis.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/surgical_anatomy_of_pancreas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_5fd8196b745ff.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/4b6f1dfa-98cd-4a26-9dbb-911830a2c35c/samsung_2333hd_tv.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/99670400709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874a4cc8-b4d4-44c5-ad7b-e435ca7fb82c/song_one_day_more_les_miserables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c03eff-43bc-4fab-8d43-484664ca1f9e/80848957194.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_aa2424523cff412eb822c8296371d6ae.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_d072abb3a4d74fc880de93a73584d33a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/596b9b56-8d56-4212-8c8a-180ad611f657/who_has_the_slowest_40_yard_dash_in_nfl_history.pdfIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_2bb822615dc54ed9bcc563c87a3d8c1c.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_fdfce48f3ca44d7db3f257f98ea0211f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df074542-7a7e-4362-9774-5574f6253d66/what_are_examples_of_sensory_language.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_f141f12b31a043c78974bed52388f3e5.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_260c2ee3ffe04ca2b956b89b4b82ea8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b83e51-64a9-40e0-bed7-9a0e46c28eea/39994595983.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_5917e38a260847489e4bf8fb1c521990.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd1649b-046c-4fae-933f-4f85147772f5/how_the_grinch_stole_christmas_full_movie_2000.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_e6471aad8d9f48ec806d683482625970.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/42976271619.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_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 4844 bytes
SHA-256: c7b220c0e65adc59feb139247c6ee6edd5336c64d36a3811d0c1d7a8af462493
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 10528 bytes
SHA-256: 1998feaf4c23870d0aae1cc3ecace7fbc1a1faecb95a854c9f548bb44d23d8fe

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