Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66dee3f253315ae…

MALICIOUS

PDF

95.4 KB Created: 2021-03-24 18:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33bc890c7594a3df952516fe08bd21f6 SHA-1: 47fc9df32ab9f82cc04edebc3e2f3295905e84e1 SHA-256: c66dee3f253315ae76614308fd81a9993bb2bdf411684d827121cb7ceba256a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic points towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=who+is+considered+to+be+the+father+of+the+progressive+education+movement
    • https://cdn.sqhk.co/dijowasedop/s6WyLjh/tituzotawax.pdf
    • https://cdn.sqhk.co/fesakesovoka/0OhfUgd/56056198760.pdf
    • https://cdn.sqhk.co/melipetoluf/hiVAhjS/xijebapugezajilazawigena.pdf
    • https://woliwaluv.weebly.com/uploads/1/3/4/6/134686062/2e73f.pdf
    • http://timinome.getenjoyment.net/how_can_i_track_my_covid-19_check.pdf
    • https://cdn.sqhk.co/vujixete/QdifihK/tidizarafa.pdf
    • http://mufosubofamar.mywebcommunity.org/the_apocryphal_books_of_the_new_testament.pdf
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/lepuvokijenawuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_388431960f3046c69419c66d88d78368.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee67371a-3db6-4446-bf62-c676adce895c/how_to_set_self_clean_on_jenn_air_oven.pdf
    • https://uploads.strikinglycdn.com/files/f8991791-ed64-47aa-a609-89e6d685252c/all_the_bright_places_scenes.pdf
    • https://uploads.strikinglycdn.com/files/5e6824d3-0716-4a2b-a197-affbb61ffb41/how_much_does_an_occupational_health_and_safety_officer_earn.pdf
    • http://tulifal.onlinewebshop.net/98042863686.pdf
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_5eeb63ec72fa4443bffb8ca7a7038c26.pdf?index=true
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_648436f3873c46d1976c398f852d94af.pdf?index=true
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_615b8ff963544d469edf1c62418bff43.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_841e20e8fd0b42ffbd66898ea0d41bf8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c79ff22-cb03-468f-9ac6-b77f9bfaef7d/mezagif.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_a16abb9ad41e41ea836570fbd60f0f25.pdf?index=true
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_befaa3e2945b4b7d95cabe1eca3391bc.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_2495527dff9f437da0989a46e071290c.pdf?index=true
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_43d5f715265b475fb9cc0d09bf662d49.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137e8.bin
97141ed13749d61da8a2860ca320eb0b8cd38123e6437b0ac2d28b447bb86f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 5752 bytes
font_01_sfnt_off00014b61.bin
062e79f4bb20a00c76a51d9a1b80b5d3cfa6aafe1de57cbdac956ea1970ac6e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 10804 bytes

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