Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a2809d71f18147…

MALICIOUS

PDF

89.2 KB Created: 2021-03-19 21:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72a1d2a8d5248677a5414e7d825d36f2 SHA-1: 59b8a33c48b3fc137c4d5a1c68b1fbe2f98d27ca SHA-256: b1a2809d71f18147f44841d57dbcdb42e23d09116cde322f37dbebd96abfef38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the extensive link farm is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=cracker+barrel+catering+pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/duvarafobax_wujeto_riwuduzof_wudeke.pdf
    • http://ravigimojamel.mypressonline.com/wuwafobugosisoginoze.pdf
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/tasizaxef.pdf
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/jukekokija.pdf
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/nopaxi-jegefileloxib-wupularek-wasuzamofabij.pdf
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/zakivonus.pdf
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/femebidanizo_kesejo_zubebawe_keluritegoz.pdf
    • http://mizifasurogik.mywebcommunity.org/aristotle_rhetoric_book_1.pdf
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/141663.pdf
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/wegasidar.pdf
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/f1916.pdf
    • https://zikovawezuve.weebly.com/uploads/1/3/1/1/131164456/lasagovowipijosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nowivopikuzud.epizy.com/berifiwagisi.pdf
    • http://xoxemofunox.epizy.com/cavallino_treporti_weather_september.pdf
    • https://uploads.strikinglycdn.com/files/93bdf6eb-864b-4394-b327-e2b96be71ebc/how_to_get_flexible_for_martial_arts.pdf
    • http://vopuxoke.epizy.com/how_to_clean_crayon_off_textured_walls.pdf
    • https://uploads.strikinglycdn.com/files/b03204dc-62ce-49d9-b6bd-d14d52ca99b7/fuboraguvesowo.pdf
    • https://uploads.strikinglycdn.com/files/fcbb98e7-368c-4dcd-aef4-983594fe8b95/gunubezilobewuwituxuzel.pdf
    • http://wifotuzo.rf.gd/acurite_digital_thermometer_with_indoor_outdoor_temperature.pdf
    • https://uploads.strikinglycdn.com/files/37347c2c-ab0e-4854-a028-9f36e7eac576/how_to_reset_nook_hd.pdf
    • http://vimixof.onlinewebshop.net/59844696866.pdf
    • http://kokalukavevip.epizy.com/vanegulu.pdf
    • http://nejimafalun.onlinewebshop.net/binixizariminenarotedegi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b8.bin
ba01d4d55a8b243c140fc04529122de6cf3f474ecba9c9c08ebbf75cfe069901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 5252 bytes
font_01_sfnt_off000119a1.bin
91644e63928e3653729ef86d6e571984f253983d315f11042e38aa6d73fcef08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 11968 bytes
font_02_sfnt_off0001400c.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 16204 bytes

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