Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f7947d4e12e473…

MALICIOUS

PDF

69.9 KB Created: 2021-03-13 13:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1289c828870451dcb4ae363dd553c9f5 SHA-1: 93e6db81900e53dd859c49b198cc5f241c28d30e SHA-256: 52f7947d4e12e47376764fd13e1883c3290472d8f8a9186632764714f47c95c9
186 Risk Score

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 0.9992

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://crophysi.ru/wix?keyword=area+of+quadrilaterals+worksheet+tes PDF link annotation
    • https://cdn.sqhk.co/vekuperik/E4ieXja/potizazuvojivejiresof.pdfIn PDF document text
    • http://phtech.site/hold_my_hand_song_ringtone7kvgx.pdfIn PDF document text
    • http://tameenegypt.com/97981479820wno20.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/vYBNDgc/at_t_u-_verse_customer_service_hours.pdfIn PDF document text
    • http://abzac.me/84052063389vcmkr.pdfIn PDF document text
    • http://phillipen.online/71274130166mya00.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jahegib/34567577951.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/cidD4gj/piwoxiwadupe.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/jjB0BdE/transparent_screen_simulated_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pawanipol/eshhihC/second_hand_clothing_stores_southern_suburbs_cape_town.pdfIn PDF document text
    • http://4bochki.ru/56477806523mq7b9.pdfIn PDF document text
    • https://cdn.sqhk.co/biwufudi/egjhbDj/74017338795.pdfIn PDF document text
    • http://dombitarf.ru/fakenoderovomewolisug0hp8.pdfIn PDF document text
    • http://garantiya62.ru/call_me_by_your_name_book_sparknotes2xyn7.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/kgg3ghZ/my_talking_cat_2.pdfIn PDF document text
    • http://azakalaza3.xyz/medical_pharmacology_books3epc8.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/zubuwujoxom/carefusion_alaris_8015_service_manual.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_6353f7e0afb047ba9c58dd47674d68a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/17881181728.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_65c4e0a7d3464987a2355a7c2027c924.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_17cb652532af412eb79847a726e9ea89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/autodesk_sketchbook_crack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/hallelujah_violin_sheet_music_in_c.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 5268 bytes
SHA-256: 0e6a0a28ecb7495fb92d15d9e323266a18a588773d1ff34fd96b10ee69c94dc4
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10784 bytes
SHA-256: 03ea1e1e62cd235674f4b5cbd4e38ac0292055b22559cb5ef4553cad9389fc0b

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