Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58e2a8aad489a7f…

MALICIOUS

PDF

76.4 KB Created: 2021-04-30 18:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b760171f2c57f4a85fc732f0053295a5 SHA-1: 6791eb7fcba9e4594c47394e8dba4db06d7980fd SHA-256: c58e2a8aad489a7ffc12f34529d310aa518d9f74e170885095f0ad0b7043bd0f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=what+non-destructive+testing+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60353f22a6a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_6000e6d787ca1.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/tikuramodemuz.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/stories_for_childrens_in_marathi.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/homelite_xl_automatic_oiling_chainsaw_manual.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/childhood_functional_gastrointestinal_disorders.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/wevegis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_605f6b4619343.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/when_should_user_stories_be_written.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/blaise_pascal_biografia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_602ab1dc57f35.pdfIn PDF document text
    • http://bositozibab.getenjoyment.net/apostles_creed_latin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_606c9feecfca0.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/kibix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timojodabemisux.myartsonline.com/actuador_neumatico_genebre.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_be220abb979b4bd28e4627bcfeab6ce5.pdf?index=trueIn PDF document text
    • http://temodorofeg.atwebpages.com/samarababes.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_4a00a3b6a0784064b6987a82f07afcbc.pdf?index=trueIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c04085-55d7-40c7-914a-921fabade02c/27896843131.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_a470db70bfb141afa68f48aafb4138eb.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/haircut_locations_open_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a745d9d-9387-43c9-9cbb-d55cf73786b9/what_are_characteristics_of_systems_thinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f766a9-fb5e-4430-83e7-681d8dc6da5b/juroxuxoziduga.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_2da2bd9c599c41f9acd12a04bef9aa1d.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5428 bytes
SHA-256: c909e8301514668f6970797c3af56ab88fea2a1e5edb373e2b7257b4247257e0
font_01_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10632 bytes
SHA-256: 9e593eafdeecfb02ec8337250cc5277e8e91db0fc07ec29e972860a4beea180a