Malicious PDF — malware analysis report

Static analysis result for SHA-256 5199fd282b60c6da…

MALICIOUS

PDF

72.9 KB Created: 2021-06-13 02:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3bbe68012e24727ed660a4043dc0612c SHA-1: f166696a600a8098df63d40d36a1c77249364894 SHA-256: 5199fd282b60c6da60b2c8d2e11484c3477fdf353bb99b84966cf0b6dc15da1b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=new+hobbs+and+shaw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5fd77d084314d.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/xelizofegon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_603918eaa3169.pdfIn PDF document text
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/josejuwetisob_zuxulabasitino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_6064bcc8dfea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_60c4b2b47227c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6028a21ce753d.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/8103254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_60243dacab87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fe73e2c55a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6043ffd700395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozakuvepar.pbworks.com/f/what_is_a_good_first_car_for_a_teenage_girl.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/doxodavitotekegovojepe.pdfIn PDF document text
    • http://bisixakab.pbworks.com/f/the_secret_life_of_walter_mitty_free_full_movie_online.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144615174/93130859290.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/how_to_train_your_dragon_songs.pdfIn PDF document text
    • http://dojejezo.pbworks.com/f/60113181486.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/145216971/shqip_sport_apk.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/how_to_really_hack_cash_app.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/reference_letter_for_phd_scholarship.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 4988 bytes
SHA-256: f51dc9fee076e4fbbd1595270cd35c14641c1e38f2cb1b82604559679fd09785
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10884 bytes
SHA-256: 8dd56ec01769d87367f7a1e9b0291e520e8fae25db7f95df4d7420c699583307

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