Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c66bc8c50fa1e03…

MALICIOUS

PDF

73.6 KB Created: 2021-03-25 00:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8cc29615e1d52847deb58f211fd35c27 SHA-1: d472958f77ef5b9215678de11804e91ca13be74b SHA-256: 2c66bc8c50fa1e03a8a4847e74c23f7b5c1de345dec4aa930b082a7b91758c4f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. Although no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=complete+gmat+strategy+guide+set+6th+edition+pdf PDF link annotation
    • http://neridofufuleteg.scienceontheweb.net/72817058349.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/ciahfgh/best_space_fighter_movies.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/xevusiti.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/garmin_vivosmart_3_large_band.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/75860546721.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/4142428.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/32984c0c1b8896.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/google_adwords_search_certification_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/NjbwOgh/41248815412.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/lobowu.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/glorious_bj_putnam_chords_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/ijhgehb/79487400160.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/e959a8ed11f81.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/FhViehc/yellowstone_cast_tater_jen_landon.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/82327013773.pdfIn PDF document text
    • https://cdn.sqhk.co/sazoteva/gjfFVOi/carnivores_ice_age_pro.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/efce3c38-6c15-49ac-9d29-023ec79b4b0a/7574847814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c187df0-a684-4107-a8bf-09e25e4a4a13/lego_harry_potter_2021_sets_summer.pdfIn PDF document text
    • http://vujijemu.atwebpages.com/5286198808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9edae2-221a-4985-841b-c67ab2a86dd4/sheet_music_with_guitar_chords_and_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec39c5d-0ce7-4ba3-83a5-672f8df3b133/samsung_55_inch_4k_uhd_smart_tv_price.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 5616 bytes
SHA-256: 4ed5f9d825ff08b3832e5047c508d0ed207649a2a9775a1d4fab915e58a8fa3b
font_01_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 12244 bytes
SHA-256: 8b9856b2f88eeb2de6b144aae01deb5b294ac429a6950566ec31660e381ad5f6

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