Malicious PDF — malware analysis report

Static analysis result for SHA-256 9914420acd263f57…

MALICIOUS

PDF

77.8 KB Created: 2021-05-29 21:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bbfd437f909d372286d04150a13be055 SHA-1: 52cd7a812af580050ee3800113ddb1e3bef20413 SHA-256: 9914420acd263f5767f5534021673bed9d51d1496304b083cbd06d3bc12899bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL 'https://zajinet.ru/strik?utm_term=fight+night+round+3+psp+how+to+unlock+all+items+in+fight+store' likely serves as a lure or initial point of contact for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=fight+night+round+3+psp+how+to+unlock+all+items+in+fight+store PDF link annotation
    • https://kefenageteda.weebly.com/uploads/1/3/0/7/130775977/ba41741.pdfIn PDF document text
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/5546669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_606787bfd2d84.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/sokozi_dinivunolibafi.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/fatetotob.pdfIn PDF document text
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/velumobes_fuvatugodab_jomej_xexipexo.pdfIn PDF document text
    • https://bofaragimemax.weebly.com/uploads/1/3/4/0/134096626/kusamurugatik.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/lelenovipewo-wutojifigub-kepaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fda3f09019e9.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/nixut.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/81ce5e.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/7b1d20d6-f72f-44ed-8af4-a8f845d5a1b4/baby_gate_with_pet_door_extra_wide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54165315-1c74-4f4a-95d3-13b729c73112/sri_vishnu_sahasranamam_sanskrit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3dbeca8-a440-4918-a7c5-97c586d7db64/nasepebumedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a8ceb8-a738-4ba2-92b9-7d707410eb43/ketalukabatamumelewegupas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ae0373-cc6b-4589-8bd6-14310f15e24b/zaluderupopawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e346570f-2cc2-4e06-bcc6-86de612e87b6/murray_lawn_mower_oil_change.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5844 bytes
SHA-256: 3e115297444d3ed9152848352c1929965e1f32f09f7ac623414fb699bad1cd10
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 11180 bytes
SHA-256: a9dc0ec520033a949de5839efcc2f5fee76bf4136dcb0e4ad97ecfef87db7541

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