Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48014c2ea14e8db…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fedb270c50af9495769d9ffdf1eef174 SHA-1: 041b3d18470d52e862e93da35ee422bbf5ca0a09 SHA-256: a48014c2ea14e8dbb2dc678f8a8c48e281ab9b083fca8a2b845bab3fb2a1b0fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were embedded within the document, many pointing to disposable hosting and utilizing UTM parameters, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery. The document body was heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=imusic+ios+apk PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/sebupipave.pdfIn PDF document text
    • https://avenue102.com/uploads/file/59457423978.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/21450840661.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/51902914060.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210907_300129976B851B54.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/18625305962.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/fokewutabose.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/11016249603.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/sizenojatesafi.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109220335298689.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/siluxo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/49428524081.pdfIn PDF document text
    • https://manenshop.com/upload/files/57346065551.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/wukaribugewofigadazudafo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/lifiteba.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/71787907855.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/votoditajulizakenavupado.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/sawepobirixerad.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/vabopox.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/98170940920.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/23588646189.pdfIn PDF document text
    • https://protrialse.eu/files/files/479323314.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19d8950a---99085062738.pdfIn PDF document text
    • http://darec.sk/files/files/tenojejugodorutimedig.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/nomut.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 16840 bytes
SHA-256: cf373ba108be353031d3b362412cece5029847ef4a37605ce5e947345ac9e887
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10200 bytes
SHA-256: 94155038c11c97a372f1bc45f5d76a71e25689bfa8bd3470ec97b3379446d274
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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