Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbb34bf7f0ab556…

MALICIOUS

PDF

112.6 KB Created: 2021-03-19 13:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df4b92ee4a5a1d9eb582bb16144455e6 SHA-1: 244cf352bb70939b9d0cb5191caaf18e794b21aa SHA-256: bdbb34bf7f0ab556c0bb450b727f76ee6127ccb2019e91d0c4f0ca8503695948
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary suspicious URL pointing to 'dafemum.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=blanche+neige+pdf
    • https://cdn.sqhk.co/devisofage/hieig8J/52825312664.pdf
    • https://cdn.sqhk.co/lexaxemiji/jAhfVGy/busy_busy_neha_pandey_song_bestwap.pdf
    • https://cdn.sqhk.co/xeveweno/wmughho/vakexalefatixoxupifukiwi.pdf
    • https://cdn.sqhk.co/navuwamas/PjcjewX/cold_patches_for_eyes.pdf
    • https://cdn.sqhk.co/molavagew/ajgxHpv/bevugiweriz.pdf
    • https://cdn.sqhk.co/bujasugawo/4Vfhi0t/50090038651.pdf
    • https://cdn.sqhk.co/zetuzire/vhcgfjc/dikaduderimox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7682b389-191a-457e-b732-83792aebba01.filesusr.com/ugd/610d21_1c155c550c7647178f3c5262d4726c4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53b191cd-9d26-4960-9580-9fb6146a6d38/27447608871.pdf
    • https://uploads.strikinglycdn.com/files/91f07f7d-a700-4f00-bcd2-5d3af480d173/77128957346.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_6517fc10f4c947f380b9f655a343d6ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ec9f85da-6a04-4224-83f1-b45e0bfc366c/dogiji.pdf
    • https://uploads.strikinglycdn.com/files/ddbaec67-ac58-4ffd-9d49-cf9841fe5817/dogiwufuzepikoviwu.pdf
    • https://uploads.strikinglycdn.com/files/c18031c1-85ff-4c24-b417-a0531761288a/fiddler_on_the_roof_movie_watch_online_free.pdf
    • http://mikusadetov.rf.gd/nuevo_diccionario_biblico_certeza.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_9908403f71d94f509caa3f002c4c0cce.pdf?index=true
    • http://moberasar.rf.gd/87050590670.pdf
    • http://vefugiw.epizy.com/smile_recharge_app.pdf
    • https://uploads.strikinglycdn.com/files/af0de316-b41c-43e7-afa7-8e26dec34a19/why_is_call_me_by_your_name_good.pdf
    • http://wepaxilex.epizy.com/audacity_1._3_free_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/7d028ac4-c101-46cd-9d09-a3afc5a2c2c2/classroom_management_strategies_for_elementary_substitute_teachers.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001652a.bin
107b7ca150fb3d7867a04c8a9f7e825029b685343c79db56ff1940d64dc8a1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1652A 4792 bytes
font_01_sfnt_off00017565.bin
9698f8b7e1837017ccf16f7346f213470f7b23aefd878e88d256068fd88d6689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17565 17688 bytes
font_02_sfnt_off0001a6c4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C4 4324 bytes

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