Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aa3f3cdf655d18…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 14:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a5b79b289339151cf505771a1739fa5 SHA-1: cf4d68a96b846eea9b097708d8d4f5ce06d11cf3 SHA-256: 13aa3f3cdf655d1884ceed096300a3fc29b629ea5b0dd1feb2c86d732b90e16e
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 0.9992

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://zajinet.ru/aws?utm_term=adele+rolling+in+the+deep+sheet+music+pdf PDF link annotation
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/3d5de398ba.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/Kjh4Jgc/mobile_gamepad_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/iyEqTjb/21080775931.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/kebetavekamilixudodu.pdfIn PDF document text
    • https://fevufimekosiso.weebly.com/uploads/1/3/1/1/131164497/denororesoj.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hdhdqii/pivirikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/Y4gciaX/kaiser_pharmacist_jobs_california.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/fRlphhq/om_nom_nomnivore.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/antibiotics_simplified_3rd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/iijfibn/fejaw.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/stock_market_crash_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/jghcjau/spiderman_hd_wallpapers_1920x1080_for_laptop.pdfIn PDF document text
    • https://sikiwakasizo.weebly.com/uploads/1/3/5/3/135318116/c9402b071dd.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/cfgzih4/liboramapimemap.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/jbibdco/hack_para_among_us_mod_menu_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/heG5ngf/88103231544.pdfIn PDF document text
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/fozizev.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/eH2Znie/74253072312.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/ggejcKg/63650360000.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/ca5e7138-b84a-418b-961a-a64ff5844173/samsung_nx300m_lenses.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/90085026959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb040529-9c83-40fe-bf85-a7bfeff837bb/how_to_sew_bow_ties_for_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0a54ce-e539-4d45-9b1d-62abfd1ae6a4/61595994052.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5348 bytes
SHA-256: aa217049097bf45503ab373f673963d9e185a92ec310b7d7c49818dcf1fe1e23
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 10932 bytes
SHA-256: 9067827cfc040b9df6f8022c664fe4180d6203c9b75f29235d2f43a555437270

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