Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e91fc45a74e3b1d…

MALICIOUS

PDF

89.1 KB Created: 2021-03-13 17:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c1f6f54c37b20bf18803d2a740200a00 SHA-1: 452844645d40fc1f1e48a5dd7b3104ef87ac41ac SHA-256: 9e91fc45a74e3b1dd4656c231e8075f55231d2309ee1b82f4ca68a3667a77735
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://leonvi.ru/wix?keyword=what+are+ionic+bonds+and+how+are+they+formed+worksheet+answers PDF link annotation
    • http://genusadnlo.space/el_tipo_del_sistema_de_archivos_es_raw_micro_sds60en.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60329fda800b9.pdfIn PDF document text
    • http://instacopyrightcenter.com/sensus_water_meter_partsm9ieu.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/shri_ram_janki_song_downloadrghah.pdfIn PDF document text
    • http://erkutungotu.com/tidonejawebh8hlx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464870/normal_603ccf82f26b3.pdfIn PDF document text
    • http://reassurez-moi-fr.info/94443772088fjd7f.pdfIn PDF document text
    • http://cardioactiveitalia.site/56177070982b4czw.pdfIn PDF document text
    • http://limaxinsto.xyz/tupip33nxu.pdfIn PDF document text
    • http://sun-italy.space/loviperaworasalavadoxesauhrrv.pdfIn PDF document text
    • http://electriccannoz.club/survival_pvp_minecraft_server_1.86xa1k.pdfIn PDF document text
    • http://future-techno.ru/unfinished_tales_of_middle_earthkg35l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6016f803ad2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_602accf2e9ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_604ab4917e451.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jukoxisojow/family_feud_word_for_mother_answers.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_119a5320487e4a2db499194e94a73f39.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_891bd351668048e1b4be64a16d6c48ad.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_4c5e8b6e98e64bf4b4019a8fc087b92c.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_15a06266cbe44fd2bd8cd55738bb4ef6.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_2696035ffe5f4b90afb52e8ae046106c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/35884555090.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_9e3d23b3b15144f1b7a2c4f7b89a7680.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_3848aff575e1454cadf9b9522787c563.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nabifovu/tutorial_audacity_bahasa_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/bluetooth_software_for_win_10.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 1684 bytes
SHA-256: 51fdace8bd53b7d2e6af2c0ab3a57c298b99a0f760d42a36c32010743562cd6d
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 5428 bytes
SHA-256: f85640b1285332ef9fa7f7a86b60ddd3410bf606ff6891f48db7436dafadacb0
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 11028 bytes
SHA-256: 52b8d153e799c733b1170cc3e4f355446aa87fb75e14c45396f9c44aec7e8943
font_03_sfnt_off00014541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14541 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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