Malicious PDF — malware analysis report

Static analysis result for SHA-256 1151f59170a143c1…

MALICIOUS

PDF

72.8 KB Created: 2021-06-11 00:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 009987935316c1e41c5fe1d18378eef2 SHA-1: b3fea2dc4b7ec8f29a07786669f35c90344087d0 SHA-256: 1151f59170a143c11466391eb3a7e657d48d6009725f982869cd1a5f2b3db06f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=khaidi+full+movie+watch+online+free PDF link annotation
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/59e80ba86b0bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_602e7a5482f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_606e6d735539e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5fca6a721bc38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60493a4247db8.pdfIn PDF document text
    • https://sowofinonapira.weebly.com/uploads/1/3/4/3/134361296/witajelitaf.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/pexunepujo-pipojuviru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62cee4fc49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/22998e29-db25-4d99-b56b-78c480765cd2/arms_reach_co_sleeper_versatile_bassinet_instructions.pdfIn PDF document text
    • http://baxikufop.pbworks.com/f/rockabye_sean_paul_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c42b6d1-acd6-42de-afee-758d8c0b1659/kabir_singh_full_movie_hd_720p_filmyzilla.pdfIn PDF document text
    • http://jazonewu.pbworks.com/f/4796501361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d31ebf-2bb2-425b-9f93-56c69081e714/34181137495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcd1b78-ff05-49d7-9d38-7f78b4201ed4/57593020016.pdfIn PDF document text
    • http://magesob.pbworks.com/f/cellular_respiration_pogil_answer_key.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/f/95479042335.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/how_to_use_mame_emulator_android.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/90601296261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbda19e-d068-4315-bffa-88a136df0e38/cisco_networking_fundamentals.pdfIn PDF document text
    • http://lexibitite.pbworks.com/w/file/fetch/144533781/wonuruwusapejupebifog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee509fbb-6010-482a-b857-1efed9f8e4c0/15081263050.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 5084 bytes
SHA-256: 09241f7d25bb5615b5ff77f941ad78c3b201b7834b8a6efcba2e972371c6b455
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10328 bytes
SHA-256: f8111a21b9d162da90a00ce36993190f5b68ba6a54c5c154d000a2cb3c99869c
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71