Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7b70b8a04bec44…

MALICIOUS

PDF

130.7 KB Created: 2021-03-11 10:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 136eb30c6f82620598275c055208d168 SHA-1: 9792c82d43cd68056a273f25e12af79be86dbbf7 SHA-256: 4c7b70b8a04bec446b7d0aba6e2e7e1b7971d0fbff7327f68af08bd11fefa9a9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9997

Heuristics 7

  • 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 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.
  • 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://pelibifir.ru/123?utm_term=android+auto+app+latest+version PDF link annotation
    • http://wipunemobak.mygamesonline.org/how_do_i_connect_my_altec_lansing_speakers_to_my_computer.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/47421202459.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/night_circus_book_themes.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/how_to_use_a_wet_dry_vac.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/sabexivefirilani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_5fdb94128b0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6048c2fbedf2b.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/sunilobuwidobaf.pdfIn PDF document text
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/8548913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_0a151b7e68f24dd48c51835786b68e9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7533dfb6-8611-4d6e-8100-bade137c12b4/93605788373.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_1d072601d5da4ee3921d0c4147d216a6.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_5c8d87095ba94db4b8db8c120f3b79fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bcf6e4-f2f9-4b6d-a954-b253c9539fb1/jemobixezix.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_cd6dbf1bb3844f4daff953f3c9d820ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89b8288-6a4d-45a1-b96e-bd5f37c3b278/what_are_the_specific_advantages_of_database_management_system_over_traditional_file_processing.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_7403410a886d4cf99b2fce8b99cc4db5.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_56f8e2d00d1a4f93a3b41069ac7922e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e39aa-3bae-4b03-a8ed-6f18c9ae205b/90291737458.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_1808ccf73eca4b12b0c58b19e5fb667b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44b00a7-d1e3-4b03-af93-c24e9fed74a0/how_to_work_legs_with_resistance_bands.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/gexavitaxebisupunudi.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_off0001c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C599 5000 bytes
SHA-256: b6734262c28678c4d4ce9f576eccd4786a65f7b5b0052919162c80fd399d7647
font_01_sfnt_off0001d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6AE 11504 bytes
SHA-256: 8d4c6ce3c5d9c4a22e2504cd4008db86322848b3dc93367b1a54508300408f29