Malicious PDF — malware analysis report

Static analysis result for SHA-256 9359e007c7e4146d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 10:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1836c0c06c86043c5c1c7825ce93b00 SHA-1: 48da3c318d07d1c42bae7ccbc28b3605cdd545f2 SHA-256: 9359e007c7e4146d8614aabde44f9a32b7edffdd675fa83d24a85887faba48b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content, such as the 'game mod apk' lure. The presence of these deceptive links and the overall structure strongly suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=game+mod+apk+2019 PDF link annotation
    • https://steammining.com/userfiles/file/92059565918.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/6990443465.pdfIn PDF document text
    • http://bdsductri.com/upload/files/xugoj.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/16451161080.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lagizasilajoto.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/91258185568.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/viwawuxediliwejis.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/8513452219.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133481997b8c---fukofovi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2109d055ca15704011eca8181af1b27c/69633677401.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/47389755750.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/ragakegosonalokisoxanun.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/dezabejuvojaz.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/67546383522.pdfIn PDF document text
    • http://chinalabware.ru/d/files/mowitakafegatinimevegu.pdfIn PDF document text
    • http://creationart.hu/files/file/ladolinukusulaj.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109190715586537.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45513331889.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/31243401491.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/25073500516.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nuzineditejabanagugovudak.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/20180425908.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/robetevotit.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/87803144398.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/79434777482.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 10540 bytes
SHA-256: f31c38cb71f7b2db4593c8f2b0eccc72701820ade97d789be4cfcdb542817f5a
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 19156 bytes
SHA-256: 195fd3977544153db94f016989d3d396ee1259539c559ce48d8209637cee7f74
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1