Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c9e1b8f835f989…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 07:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8311f76410df0771e60f17486b3b8cc7 SHA-1: 9a47c91d8fc64beaf27d861f02c17e5b93cfcc9d SHA-256: 94c9e1b8f835f989ea96a1e47ff525bab3e76d4b243d24d90b1e04cf4ff16ee3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://seumenha.ru/wix?keyword=major+scales+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/nenexozoz/5cOGYjd/minecraft_education_edition.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/6639431.pdfIn PDF document text
    • https://metipejoxeve.weebly.com/uploads/1/3/4/7/134725173/5050637.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/hfjfhgc/sleep_sounds_rain_and_thunder_mp3_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6018eca372083.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/WgdjeDB/calendar_calculator_2020_weeks.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/8prjijb/tobofezuriwepojisakanesij.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/FhViehc/yellowstone_cast_tater_jen_landon.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/ghghIgj/bodoxijonivu.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/f4c6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fda8fde57249.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/7334104.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/giijgie/santa_run_3_cool_math_games.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/22PgLEu/south_harborcreek_umc.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/dorufiwowurajo.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/ijNGLbX/minecraft_pocket_edition_gamertag.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/xukanomarexumu/facebook_app_manager_auto.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/64587308678.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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 5124 bytes
SHA-256: ccf52b36853bf32a923cb17897c6025768ce2e12f170c9e7c9f2fc0ae0e07686
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10400 bytes
SHA-256: b054d144fbeb94f224d589062420151148902549f9323eebbc16f0d9382801e8

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