Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa2908c6221d8bc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 23:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ca626ca4515f1d9840347818ecedbaf SHA-1: 0f31eddc0d3eaca34a10c8451de3457ffb05f0e3 SHA-256: 1fa2908c6221d8bc41cd8defa2d4dcd490ae887f2539435105dd0a4cc42641e1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. One URL, in particular, is associated with a 'lovely dating app mod apk', suggesting a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8014

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 http://4998horo.gmmwireless.com/contents/files/12627256350.pdf In PDF document text
    • http://school19-zav.ru/userfiles/file/gozidejujedulorekerojij.pdfIn PDF document text
    • https://asiapharma.la/files/files/24185482312.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70858928538.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/14511763677.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/23745026309.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sifisikupirarixuzepifumu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xokizutu.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/42254138849.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/resimuwizugokanobixaful.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/rawesadusokidosata.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/50675220803.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pamibadiwexut.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109040598_239729987.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/10032110205.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/kolakitawadekuranopuv.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jilejafagej.pdfIn PDF document text
    • http://apart1day.ru/file/dujegufawifokavotiteb.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/kegotagekonevuwafusuvil.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/14208174086.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ad37cec13e7c611ee6cdbd5295e3e0d3/sogerotarizosabomu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xorovakepevokaguvevodewif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lovely+dating+app+mod+apkPDF link annotation
    • 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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10696 bytes
SHA-256: e6c7efebd75c5420ec061645d71314b304f2541c6c3b409297acfac2e6c6f89b
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16736 bytes
SHA-256: 81aa7134416c294f5b46edbc9c8057611a8a907d30021f2fa72f63c20716f0f8

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