Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fe453bc857e04e…

MALICIOUS

PDF

80.4 KB Created: 2021-02-23 11:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd0410b7999b02ef8ea591cd75953f19 SHA-1: fe81d209ccdb8eeef78565f3fe2c5e1784f3d7b9 SHA-256: b9fe453bc857e04ed4083aa287fac10394922e88d5e7d5d3095f11fc7abc65d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • 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 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://druttle.ru/strik?utm_term=harry+potter+spell+book+pdf PDF link annotation
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/zujor.pdfIn PDF document text
    • http://milesnires.xyz/37086459076ra7oj.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/hbgegel/warhammer_quest_blackstone_fortress.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/dEWgjiO/withings_watch_charger.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/bc662e0117.pdfIn PDF document text
    • https://cdn.sqhk.co/bafujifi/cajdpig/search_and_explore_instagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6016b43d8cad8.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/cat_fork_truck_error_codes.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/kakilozurexuwut-genavito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_5ffbb1d544584.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/ad4c62cad0a1b.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/ykjEUhd/slide_away_video_with_lyrics.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/869623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozapuzigopen.epizy.com/79002459274.pdfIn PDF document text
    • http://roroturazukixij.epizy.com/rubevusu.pdfIn PDF document text
    • http://gugujis.epizy.com/93318438200.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5304 bytes
SHA-256: 1fa340db185c2c9d75c8d0931639e1e4631b77e74d564c64621bef7e29c96902
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10924 bytes
SHA-256: b005aaefd8fa7b949d3cfdcae9e82ece992e333ba899a5587d27b21a19853108
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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