Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77a71d77970b543…

MALICIOUS

PDF

80.4 KB Created: 2021-05-27 18:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7a0e350c119b88f45747fd32a638f6ba SHA-1: 5eb79f6908a6abdf695ff32114cab6079c44ff86 SHA-256: c77a71d77970b5431080279f9e64ca2671d7856292ec0892e4120d24a2ae5641
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to redirect users to further malicious content or phishing pages.

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://xezojetit.ru/strik?utm_term=raiden+mk11+move+list+xbox+one PDF link annotation
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/fotarika_sibupalenizin_duxixudes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_604ee42acc989.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/5905231.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/5775715.pdfIn PDF document text
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/5f62a.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/fikanowaxer_zupofox_rafesipiv.pdfIn PDF document text
    • https://bofaragimemax.weebly.com/uploads/1/3/4/0/134096626/gukozodebabu.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/8a03a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_60010517b40b2.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/2000518.pdfIn PDF document text
    • https://jutikuned.weebly.com/uploads/1/3/5/9/135966087/velepedufojavu.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/pipam_peweko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_600a77ebd4f73.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/faxevuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_60134eaf2959a.pdfIn PDF document text
    • https://larikizog.weebly.com/uploads/1/3/1/0/131071312/6012611.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/882ea1a1-555c-44ab-880e-bb070a731cc7/janujonetofuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a0a571-2f06-4147-9197-aa3031574c22/suzuki_samurai_engine_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e51970-97ab-4b04-8306-2a722e4750fc/sportspower_12ft_trampoline_parts_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fed7a70-fae0-4c07-a5f5-9a838a1d8fad/fewizunawikerekem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4510d7-a2d7-4d97-9029-f7d2957155c4/how_to_use_evaporative_cooling_in_humid_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0cd9a9-29d2-42f1-bd98-c2e6b9a5fdb7/jagigumaxanikala.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_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 5268 bytes
SHA-256: 66fdffb78a41fc29aa4c9b601360092f9b56829dec154e7ea208e6a02ae79fda
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 10532 bytes
SHA-256: 30369acee68829107c5410e675e253b9b7393a667ce175a0979c8dc63f8603a4