Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f820c3ff0f8a855…

MALICIOUS

PDF

82.0 KB Created: 2021-05-30 18:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d6f597b6f775801174a61005329f66d SHA-1: 29cc57faec85e0a836e07bc9ae2858054d333f01 SHA-256: 5f820c3ff0f8a8558cff6907b489fbf5887ee0ef24c7988971eab28a5dd8c410
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 0.9993

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://jacksth.ru/123?utm_term=bedwars+minecraft++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452862/normal_603df855c908a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_604a0fed3bd87.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/6000791.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/4179886.pdfIn PDF document text
    • https://poxesogu.weebly.com/uploads/1/3/4/8/134854809/jometozaremapit-kemafoxewezosu.pdfIn PDF document text
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/5494758.pdfIn PDF document text
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/lotol.pdfIn PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/5676558.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/4498380.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/tezizu.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/burakigise.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/rijetabesa.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/0b357ee8-e56f-4ded-8a12-ad24237818a2/30913067129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70bc7ab-bfb4-4ecf-83e4-8a899e6406f5/53933918616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b0032e-9a8a-4547-a351-f390de225954/4290987091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b543261f-5592-4fd4-b611-e3661d5f6437/short_story_on_child_marriage_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd58f0c-e2ee-42cf-a4ce-4378eaa09f3e/18907678147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67dbe6d7-1d4b-4042-92c5-50f80559b0a2/47424963787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfc4e38-5a58-4829-acc1-8bfa2dc5dc0d/magellan_roadmate_1400_update_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096a380c-a8db-4504-9864-015b7bac64c6/trades_about_to_happen_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d1a6b3-3a29-4506-83b6-5e7b6d59d940/dilukol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852d2682-d2b7-486c-9c07-83f0fa032655/44993502253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deec654d-142c-4814-a55c-cb8d384729ea/what_does_the_endocrine_system_use_to_communicate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad7c449-93a5-458f-8990-8f149c3d460c/nevuxokotira.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_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 5276 bytes
SHA-256: c956197c7a2d82f32b04fc9d91437e70677b52b0c55c9879f5b6e45e98468dd1
font_01_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10660 bytes
SHA-256: 50c1c8dca019b5293ff04fe35e09480d3cc0d4e94a2abe18b4474b759cc49424