Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1b3dde9990210c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 23:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 514cb31e4fe250d506bbad9addef4582 SHA-1: 584a3d9d7921232325741fc814306cf44295aa57 SHA-256: 8a1b3dde9990210c4cca11f372baef2031aa10e55a8158f6fa1a9a1e9ffec2f4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable link farms pointing to external PDFs. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=total+war+battles+warhammer+android
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cc006ac7cf332fc05e7c521fea7e2b64/31816728659.pdf
    • http://czpohledavky.cz/userfiles/files/48289644051.pdf
    • https://5703n1n6999-6a55.com/contents/files/85300018284.pdf
    • http://comlark.ru/userfiles/files/kumalab.pdf
    • http://megalabsrl.it/userfiles/files/26910603338.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/sosabomitulasunuveboseg.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/40817146307.pdf
    • https://cityface.cz/res/file/videxutarefemisefipuvo.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/jukivasiliwuxe.pdf
    • https://umutisi.com/umut/upload/files/18690403459.pdf
    • http://www.larucheapain.fr/ljk/file/8368684380.pdf
    • http://dui-antidote.com/images/userfiles/file/rafakugiluxa.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/kapuwibapofufug.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/49796715496.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/80525090193.pdf
    • http://bainihu.com/upfiles/editor/files/sanejaxapufirajetajap.pdf
    • http://ilksolar.com/Images/Media/files/bugazodamutowovuj.pdf
    • https://jurad.eu/files/file/52452456414.pdf
    • http://safarang.com/basefile/files/87418279007.pdf
    • http://titusauto.hu/kepek/file/12360061658.pdf
    • http://grupposcorcia.it/userfiles/files/45272013498.pdf
    • http://abwnickersonplaza.com/uploads/files/nodurosopebevibis.pdf
    • http://estatepie.com/files/userfiles/file/kusoga.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614380778ed54---varalopabu.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdf
    • https://philly.drinkpoint.com/uploads/files/lemorunolapupagaluvom.pdf
    • https://uat-tunisia.com/userfiles/file/sewatovopawo.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://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_off0000c3c1.bin
88eeba99b03360928c438faf6a44ba9db6ab268f7d58da96384773adaef9aa67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C1 17956 bytes
font_01_sfnt_off0000f21c.bin
bc2c4454b39078447ce2ecedc59c8acf0c5fd5a173de0f254d37504676bd57cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10700 bytes
font_02_sfnt_off00010a8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.