Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0f16ccae4f6685…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 03:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6ff5e11c05121005bc818c97854151e SHA-1: 7c94474e5b8165919d9519adfe370fde1913c300 SHA-256: af0f16ccae4f66854860fa45a1843af28aa59ed4eb1c5f09fe4bf109e59e247b
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document body, though partially corrupted, contains text suggesting a lure for downloading content. Several embedded URLs point to disposable hosting and link farms, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=mckay+building+construction+volume+2+pdf+download PDF link annotation
    • http://timurberg.ru/873607558602e71w.pdfIn PDF document text
    • http://pavelaxokegamud.22web.org/where_is_the_filter_on_a_whirlpool_6th_sense_washing_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_60222154577dc.pdfIn PDF document text
    • http://zasigugela.iblogger.org/bived.pdfIn PDF document text
    • http://komarovskii.xyz/21718815660ef5zz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601198310ce9a.pdfIn PDF document text
    • http://argo-tourism.com/parts_of_speech_activities_for_high_school0xkkm.pdfIn PDF document text
    • http://tohld.in/401672887504xib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_6030149c87134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5ff27a18f3d5b.pdfIn PDF document text
    • http://axacheat4.xyz/41115069303rb9nd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6026366949d01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/sheet_metal_gauge_conversion_chart.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_42ae743616e84844b34765f19f1acf3b.pdf?index=trueIn PDF document text
    • http://girafarurogu.rf.gd/pepad.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_fa560f6a5acd4230acc36fa0946d448c.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_68f6aeb3d5694ad980e1e047e7e92f86.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_6d7ea50f38834794bfbb45f691ca3789.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_5f1a48d4b9be40e9848ba3d27156f11a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/blue_formal_dresses_with_sleeves.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/exercices_pronoms_relatifs_qui_que_ou_dont.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/cyrano_de_bergerac_gratuit.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_2cb41629df634f328e3045273bedf0ba.pdf?index=trueIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_13d7f57332d2400b852cc2d1c24adbcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/can_we_connect_apple_watch_with_android.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_580f58bb67fe4363b02556735dbe5727.pdf?index=trueIn 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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 6072 bytes
SHA-256: d13b184e3506d478590fce5b8230ba2294d6d5b2096c9d16588cf4682f66c509
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 11132 bytes
SHA-256: fd1c33d7f2fcd5bd7919c5b61888393748fd36b1ecda7054c8a432e7864a1741

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