Malicious PDF — malware analysis report

Static analysis result for SHA-256 156496c5266b472d…

MALICIOUS

PDF

74.3 KB Created: 2021-05-29 22:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9238516c1d66f5f3effd86d816ab8633 SHA-1: 04b23884d8fbe701217ca89428ae925c3d784ecf SHA-256: 156496c5266b472d72f904b3ec41cd8599093aa0ef68df36c1697e78655e6305
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. The primary URL, https://xezojetit.ru/strik?utm_term=roblox+studio+download+macbook+air, indicates a lure for software downloads. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=roblox+studio+download+macbook+air PDF link annotation
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/939c868e65fb3.pdfIn PDF document text
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/6810953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_600350a87bdb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6058f8294b3d0.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/kogofobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe3d60ea9862.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/mitidufi.pdfIn PDF document text
    • https://tasogedogag.weebly.com/uploads/1/3/4/6/134606554/4650575.pdfIn PDF document text
    • https://tevuluzusat.weebly.com/uploads/1/3/5/3/135397550/1109242.pdfIn PDF document text
    • https://nenuxigibasus.weebly.com/uploads/1/3/4/6/134694542/nodupopurusutakamim.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/xodadukod_zanazopoful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6053910b42cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_602c26622b63f.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/7572823.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/d47f4c38a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fe04df08d51d.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/kalavijemopiwi-lakevujot-bodet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406208/normal_5fe2909394fff.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/d96916e1-e012-4168-a435-dcbd62e3d040/homelite_hydrosurge_1700_psi_pressure_washer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c58f9d8-5e1d-4d7a-9142-e65b87d3e801/how_to_use_innova_3030_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997bfb8f-5d82-4b16-990a-14542ea06157/pivolaro.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 5456 bytes
SHA-256: 14b8ae512c808333ed04a04bee6a9a81a2e1f23b2e44f996906074db4bd6814c
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 9972 bytes
SHA-256: f4a95335c658bd38bff8679f703ba2ddd6a02f9a628dd6d1072d50d64f597175