Malicious PDF — malware analysis report

Static analysis result for SHA-256 047b6130b2d56a47…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 13:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c4b006b93361db22117807c1a87aa7 SHA-1: b3e8cbacf787c21fa2ebf4e05195d9bbffe932ee SHA-256: 047b6130b2d56a471955859d923952e1cd6bee6d0c9b15d837530745d20a64ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs within the PDF document further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=passive+voice+present+past+and+future+exercises+pdf PDF link annotation
    • http://zhouzhuanx.com/v15/Upload/file/202194918174993.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/lipose.pdfIn PDF document text
    • http://maihome.hu/admin1/file/82106224263.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/56e6fe345cdc691366ca7ffa3550ad86/suxefipafawopovazul.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/70359226699.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/sidomimosenifuvazozu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/ziniwaxivanuxowajizekulow.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/59415674960.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/kaladawisogosuzaf.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/85133316342.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/58423865695.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/dexuwepuxogolebaw.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/48763561668.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631508300.pdfIn PDF document text
    • http://fittbikese.hu/files/file/xetoma.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/41966143072.pdfIn PDF document text
    • http://cissi.it/userfiles/files/9428584941.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/bojigatarevuriliwapofebuv.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/4703738541.pdfIn PDF document text
    • http://vipdiler.ru/files/file/78775798415.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/88207100866.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.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_off0000b6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 16100 bytes
SHA-256: 03127bde6cce6de415303b6f7672d8866d86fab69b96122b1b7c31f682d4b830
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 10836 bytes
SHA-256: ba8f80e401c7e99a6ff27d18d1d3937e89ac9e5bc5e9d713ec40eb1626abf6ce
font_02_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1