Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da22f48110d455a…

MALICIOUS

PDF

81.2 KB Created: 2021-03-05 10:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af2936b0f259db305317f343e0e8b63f SHA-1: 6c1b8a54c5a69e6e7871275e199d7a2aad317c63 SHA-256: 7da22f48110d455a05e406e0bcc27569d42f0f62f5cb67fbacd2e08f276806f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://druttle.ru/wix?keyword=applications+of+radian+measure+worksheet PDF link annotation
    • http://dimax-matrasy.ru/69052601541rulbv.pdfIn PDF document text
    • http://by-roof.ru/16502471510bp5hm.pdfIn PDF document text
    • http://flowerport.market/wulizefibadunovunavese7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602f4d87a09b0.pdfIn PDF document text
    • http://figuzunifowet.iblogger.org/how_to_train_your_dragon_season_2_episode_13.pdfIn PDF document text
    • http://frut-tree.site/kali_linux_android_tools_installhelqi.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/which_myers_briggs_type_is_the_rarest.pdfIn PDF document text
    • http://viwimewi.22web.org/gagav.pdfIn PDF document text
    • http://teplotronic.ru/acordes_de_guitarra_sostenidos_y_bemolesu7396.pdfIn PDF document text
    • http://vykupavto54.ru/87057745261uaiwh.pdfIn PDF document text
    • http://fakts.design/61229703216vfgdr.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/at3hbgd/rirosidunovepefododutokeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/iieRidk/besopa.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/gdiazRk/79588402394.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/monthly_safety_topics_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5ff42c6b449fe.pdfIn PDF document text
    • http://universal-kirov.ru/what_topics_are_in_chemistry3ewwr.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/eHjf0ii/skins_for_minecraft_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/i7JuI78/61917697350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabopusafat.epizy.com/setewogarukegesi.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://scripts.sil.org/OFLIn 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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 5540 bytes
SHA-256: 622bc5ce7f5eb6a6e94cb4d369eb2135da324665cbda45bd477ff457c702144e
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 12016 bytes
SHA-256: 9c6ad09af26c887aeb6c015108aba049ee1fe14bd3e3fd477ab3e3750a54e497
font_02_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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