Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f0abef85054fac…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 22:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c03f8a5ece03b5e78022d167c545e1d7 SHA-1: cb6ba1bf02a9b5985faf085b04c10fb7c83158b9 SHA-256: 33f0abef85054facb4359fd30b68b2aa14991f2e25256d4c1f47472b01e17447
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is part of an SEO link farm and a redirector for phishing, disguised with a diet menu lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to suspicious domains, likely serving as entry points for further malicious activity or phishing pages.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=low+carb+keto+diet+menu PDF link annotation
    • http://thailandlove.site/gafemowejevirava8tdch.pdfIn PDF document text
    • http://hyipinvest.site/fixosexuzunudarupewoj7dw9m.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/baderogufavigegaga.pdfIn PDF document text
    • http://goproits.com/270144584312rsl.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/fcdd5.pdfIn PDF document text
    • http://mastericy-chistoty.ru/haiku_worksheet_3rd_gradepjlb8.pdfIn PDF document text
    • http://knitfqph.site/why_are_the_maximum_principal_stress_and_von_mises_stress_differento5cj8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/lantern_vpn_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/bajosavupamoladerogolox.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/bissell_powerlifter_pet_hand_vacuum_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/narasimha_reddy_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/60240061368.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/dusivekakibutunuj.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/6564475098.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/cdc_schistosomiasis_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662dd465-60f8-4142-95ad-01eb8a89599e/20617491943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25459bfd-0009-4d51-ab85-4cab8ca5d705/how_to_control_position_of_dc_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/hedge_fund_market_wizards.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/puvozabowuzefanil.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/jethro_tull_bouree_flute_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/sikimerinumewirutam.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_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 5112 bytes
SHA-256: 735a6e192d09eb7e9f5c3348fb6be6729db9ca87d3d70a2c1424b6ee13fecd3d
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10840 bytes
SHA-256: 916e01850ec01bff564c52b399b12d3b5856c841ab99ebdcee3e98b4da5ad143

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