Malicious PDF — malware analysis report

Static analysis result for SHA-256 1538b22c5652eb28…

MALICIOUS

PDF

67.1 KB Created: 2021-05-12 06:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e0e5638b1ed2d3b6b050a35b15782813 SHA-1: 99582e8e1f58c278f3e13b061cb9f597ef9cb6f9 SHA-256: 1538b22c5652eb28071243ef6385d4fbea8fcaa29d6073cc2728b8a3ee456e19
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One of the primary external links is to 'https://kuzutuzo.ru/strik?utm_term=fluval+fx6+lid+fastener', suggesting a potential phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=fluval+fx6+lid+fastener PDF link annotation
    • https://sixobeludid.weebly.com/uploads/1/3/5/2/135298518/serolilojemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475216/normal_60450bd220e89.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/xaxopuzipijib-julozigoz-valepazobe.pdfIn PDF document text
    • https://guxulixekakuved.weebly.com/uploads/1/3/5/2/135294256/fumeviluweka_kekovigosan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_6067cf9929d9e.pdfIn PDF document text
    • https://makigomeludawuk.weebly.com/uploads/1/3/4/7/134748455/fuviximot_pukozinot_gugaked_mugature.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/gotopolatikifeduda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_602609af841db.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/45211c71-e366-4a5a-bcad-5737787d4388/what_is_music_an_introduction_to_the_philosophy_of_music.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_ad42eae7d770477b85f2d4d03efc88c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd18174-a8f0-4602-acc5-6d53e01f8dd9/schooled_by_gordon_korman_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7078cfe-0db0-4edc-bba2-9e6cfcf33739/marketing_strategies_for_small_business_owners.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_9023a21e02f74f5a94b405113864d04e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f9c649-9e74-4242-aef1-1b9172e952ae/paxolakugajorode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b666b7-a75f-41f1-bb44-129373130d8e/wemaduvikigoxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf31794-0541-485a-af49-e1ea4a49db5a/how_to_solve_literal_equations_calculator.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2034e4f46df14aa49b2dc46e08bb75b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1c001a-c5f8-46f0-8a98-3d789ded0d95/83811039678.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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 5136 bytes
SHA-256: 61de846cef0e15097e37dc577ce0158144bafda72371eea97be6bdd1021b74e2
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 10764 bytes
SHA-256: 1df4947d24b1f7fffe04ce942d935df879e5bbf7d8c5b1956a0fc87c85042542