Malicious PDF — malware analysis report

Static analysis result for SHA-256 687ab3363e2954da…

MALICIOUS

PDF

81.9 KB Created: 2021-04-30 15:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14465b208db4e7272afc66f850f1913b SHA-1: b15c2d11098cade9ad9e840a1189b086da234ba3 SHA-256: 687ab3363e2954da81fe9b608ced35db66cc86234f7aa34eaaae38564c9d26c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=how+to+remove+icloud+activation+lock+without+password+ipad PDF link annotation
    • https://fukoroxovelamos.weebly.com/uploads/1/3/0/7/130776486/ffcfd0f19.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/atresia_biliar_primaria.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/reasonable_suspicion_training.pdfIn PDF document text
    • http://gododerur.66ghz.com/lata_shastri_krishna_bhajan_audio.pdfIn PDF document text
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/182327f3.pdfIn PDF document text
    • https://kafijojiwagovi.weebly.com/uploads/1/3/5/3/135387916/8548064.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/3052907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_6068698399a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_605d926869f32.pdfIn 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
    • http://modunozig.rf.gd/65721397975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa651588-1687-449b-a667-f6024fa8ca08/26454954295.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/26210486733.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/aarti_sangrah_lyrics_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40b8534-4f21-436b-81c9-eb53f110259d/classical_period_is_also_known_as_the_age_of_reason_or_age_of_enlightenment.pdfIn PDF document text
    • http://bezepegu.epizy.com/westlife_my_love_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1471cb15-ae9c-470c-8035-11a4f5c448ad/diary_of_a_wimpy_kid_movie_2017_full_movie_online_free.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_4c79ecaa23e34d28a522e336d602416c.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_4ca85ea3fdb7434187d7601675160550.pdf?index=trueIn PDF document text
    • http://bobigake.rf.gd/11862175207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde0ca0b-96c8-44fd-a5f5-a0f1a78d3398/are_oil_filled_radiator_heaters_energy_efficient.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_e5c69f2436534001abc99ca7cc2fed17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cfe3c9-6f6c-439b-b0da-dfcb60ec11b0/76759397970.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_760717be39dd4b0f984ec13b013ba5ee.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5372 bytes
SHA-256: 948697e22535eb0f6acaa4743ae3a2c4182c7755196e881c7098b6e8e135ad0f
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 10980 bytes
SHA-256: 00bce1fe517d2f6fcb63567754dc6214224d2353b84e7675accfc87a7ebf524e
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230