Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eee1aa040a8fda1…

MALICIOUS

PDF

68.8 KB Created: 2021-03-24 17:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 60309c1964828d2f5df908dddc7ea498 SHA-1: 9741de6b8aa0327683a8dd2d15cbdb4b37d27da5 SHA-256: 3eee1aa040a8fda194719a7e5db490d52a36101928b973644092d0780bb0511c
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 0.9998

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://dugedepap.ru/123?utm_term=big+orange+menu+pdf PDF link annotation
    • http://detalives.22web.org/anna_karenina_book_online.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/36131235200.pdfIn PDF document text
    • https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/7317306a.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/debofik.pdfIn PDF document text
    • http://nofovukad.iblogger.org/basic_anatomical_terms.pdfIn PDF document text
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/810124.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/zokepetiwag.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/4980270.pdfIn PDF document text
    • http://nogafadak.iblogger.org/87288728136.pdfIn PDF document text
    • https://basivuto.weebly.com/uploads/1/3/4/6/134646412/15b7d3929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/garorowa/agnisakshi_kannada_serial_songs.pdfIn PDF document text
    • http://giwigevo.rf.gd/audible_reader_for_pc.pdfIn PDF document text
    • http://nonetol.rf.gd/pebezawolami.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/christian_psychology_textbooks_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/rawamusad.pdfIn PDF document text
    • http://peraguzenoruwof.rf.gd/fitbit_versa_lite_notifications_stopped_working.pdfIn PDF document text
    • http://milulesaxos.rf.gd/sirabuluwixakaveremogi.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5200 bytes
SHA-256: bf9c109a3c1f58bed539c4ebf75967ecba66f0534db8ee9ea99917ec60fcdb52
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10608 bytes
SHA-256: e87da1eea4b46f0175affe383cb4ad90663f562200c3312a2438e3e71212e4c8