Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0a9f919c28b2d8…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 19:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fac64edd279fa8fb37c92b6150f3168e SHA-1: 80cee09df2f6c6afee586f9d03f2b1417f80e347 SHA-256: 4b0a9f919c28b2d8a70f1b2d6a79f28e1e40614e24001e0aa015bec85d29f910
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://nipisod.ru/123?utm_term=personal+development+plan+template+childcare PDF link annotation
    • https://cdn.sqhk.co/wuxidubez/ejehjgi/49235899552.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/sikusalezati_zosafuladuxube_visonapinazaze_nagiz.pdfIn PDF document text
    • https://cdn.sqhk.co/gepatunasux/UkAgeha/sadixulopixuf.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/how_much_do_cops_get_paid_in_america.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/vgehFoc/dead_eyes_lyrics_in_flames.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/guxuluzixetafosepugonaj.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/luzagule_mizex.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/ihiOYYK/nezolasaxotepefipireza.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/igxzhbM/oklahoma_city_zoo.pdfIn PDF document text
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/xoragugaxolesubavon.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/ejiijf6/match_point_movie_free_for_mobile.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/fafavosuku.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/e36baf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusozevukatamir.atwebpages.com/angelcare_ac401_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983deca7-f6b1-49e8-a66e-b71cb431ec19/nikon_d3200_bundle_costco.pdfIn PDF document text
    • http://fafigumo.rf.gd/livro_antes_de_partir_colleen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554a65b0-4206-4aa5-80fc-6e5123e2463f/26337324262.pdfIn PDF document text
    • http://fawipiro.rf.gd/kenneka_jenkins_autopsy_report.pdfIn PDF document text
    • http://suvumudupese.epizy.com/gazejasujob.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5376 bytes
SHA-256: b35827a99f92b3852f1942a0dde4d89e6a66d5b3750260a202ccb1ff9dd70ecf
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 10508 bytes
SHA-256: 4151d0b375ad501e0ce3c34ec79d7ca38c4b8e0a6bdcfa4df004885dd0870266

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