Malicious PDF — malware analysis report

Static analysis result for SHA-256 4daa0ef8ce15e4f9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 17:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d291c59b42befd7baef1e2b1112be363 SHA-1: 2d25e428ccad65b972c44233815e166451128c62 SHA-256: 4daa0ef8ce15e4f9021922aadbea9a73bc0a1e1a3bfb1dcfff3ccd20c7c49c93
146 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. It uses a callback-phone (TOAD) lure. 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 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=the+ravenous+pig+magical+dining+menu PDF link annotation
    • https://cdn.sqhk.co/wexopaxine/ejfstjg/acneiform_rash_egfr.pdfIn PDF document text
    • http://baykamif.space/sasikirokojuladgjrck.pdfIn PDF document text
    • http://brosbass.com/jurikideparitklev.pdfIn PDF document text
    • http://torchqbfl.fun/13521922387ps5cr.pdfIn PDF document text
    • http://igbusinessabouthelp.com/3427740556mutfx.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/OjfGieL/95081469252.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/jNjj9ij/transformar_binario_a_texto.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/72523207552.pdfIn PDF document text
    • http://zozoriba.iblogger.org/average_emergency_medicine_physician_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/ejF5jc9/soccer_stars_united_galaxy.pdfIn PDF document text
    • http://obschee.xyz/xaloxofofasb3nn.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/yoga_breathing_exercises_to_strengthen_lungs.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/vSgeDhg/lepisokexode.pdfIn PDF document text
    • http://mon-cmbretagne.best/litufebobarofot7qm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikomiwewo.atwebpages.com/99007114760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c127bea-7dac-4975-b1fd-3e07c015b853/33942029131.pdfIn PDF document text
    • http://marurutefa.atwebpages.com/jalafoxebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91061f2-cf0f-4a8d-b88c-d2a77786b2b9/duo_therm_rv_air_conditioner_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e921e63-574b-4c9b-836b-b3a2cb765c0c/define_social_contract_ap_gov.pdfIn PDF document text
    • http://nekepozime.epizy.com/googlesamples_android_architecture_components.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ea51ec-8fe0-4672-923b-84941b697858/doll_house_kits_for_18_inch_dolls.pdfIn PDF document text
    • http://fozufafetad.epizy.com/28254657312.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 5496 bytes
SHA-256: b776863a94fa28f83d35ba70ce5408e35f338d254617b3665fa40064b77cf241
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11232 bytes
SHA-256: 11c1758b227f647e8c4887a4144733dbaeeb9ca8e103e7769d62eecdf9fc3a9b

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