Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bace1edcc76cc3…

MALICIOUS

PDF

82.7 KB Created: 2021-03-12 18:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b305edf444bd6bf36bde1805603a83af SHA-1: e199cf383381b5b09749ed768fa40078a0d5c1e7 SHA-256: d7bace1edcc76cc3248628c3a5e229960a4b484c635dbd22525d497e1e5a6187
134 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/wix?keyword=midea+portable+air+conditioner+user+manual PDF link annotation
    • http://revilokepudidu.mygamesonline.org/what_is_the_entertainer_personality_type.pdfIn PDF document text
    • https://cdn.sqhk.co/bidubuwawi/6q5PTgg/vuvilexumexewafexod.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/how_much_do_pc_world_charge_for_repairs.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/what_is_the_best_above_ground_swimming_pool_filters.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/fKvnif9/17048675133.pdfIn PDF document text
    • http://busforpay.online/vebivimijegidebenizedot1pe19.pdfIn PDF document text
    • http://curvepreloved.com/manual_camera_pro_dslr_camera_hd_professional_apkpurekg5ta.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/onn_cd_player_radio.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/hHHfMgL/music_and_nature_sounds_for_deep_sleep.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/jijik2m/benowedekawejuwiben.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/convert_base64_to_blob_javascript.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8c9005-b106-4f79-8958-a7d38b098444/how_do_they_measure_bone_density.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57335696-7edd-4e53-a439-8ca7533ab7ae/56099063470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c08775-766e-47bb-9075-9a6d807310fe/17059718532.pdfIn PDF document text
    • http://lijivuzase.rf.gd/analysing_and_presenting_qualitative_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6c6f3e-8c8b-45d0-94be-7ecfcaa3d3ec/total_gym_1700_club_cost.pdfIn PDF document text
    • http://xizabefozuk.rf.gd/jixukajeruwugewiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9822b4d-f18a-4e05-9371-a0d1dc85a8ee/tipos_de_comunicaciones_escritas.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 5364 bytes
SHA-256: 35dfec2d2038273dc0b968242d7899bb7392a84600f36978b20cdf391fe3cf10
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 10868 bytes
SHA-256: c6f7b317ad08b8c7e83ff7dad871c38af79328982d4e1bc90c106a31bf738c94

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