Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69b19a8cc1f6ccb…

MALICIOUS

PDF

71.0 KB Created: 2021-06-02 17:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 81066d9392e92ab695e78004e4a56c1a SHA-1: cab08a5d3d91b9c06b55c58c50b5c91937efcd2e SHA-256: d69b19a8cc1f6ccba2d42ac0c342f4ee719cbabe2460d0d6dd2f3e6c6ce4955f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=spanish+grammar+exercises+pdf PDF link annotation
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/60c8d02808762eb.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/5230c6e9e90d.pdfIn PDF document text
    • https://nitenativab.weebly.com/uploads/1/3/4/6/134698737/pepojutemamapa_fiputet_gabugizo.pdfIn PDF document text
    • https://mefutugotipefij.weebly.com/uploads/1/3/5/3/135304762/9804811.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/pokirokonexavevuvo.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/5936912.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/4031144.pdfIn PDF document text
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/a7695d3266.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/pewusitoxalinufar.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/9445924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezeliv.pbworks.com/f/53720627285.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144500475/what_year_is_a_john_deere_lt155.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/49815230528.pdfIn PDF document text
    • http://masawumel.pbworks.com/f/how_to_pass_the_mblex_exam.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/94046709358.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144506721/lunchtime_results_today_hot_and_cold.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144512865/blue_earth_county_tax_assessor_beacon.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 5708 bytes
SHA-256: 870e67e522c2bc193e886fb025fead99b714579914e2cfcc68170e2610552dae
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11580 bytes
SHA-256: 30326354ee84f49cd4bf09c585bad71bfc0e1feafec9165a99e7bc48e635a44c

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