Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf89fdeb27cf7b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 15:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 70c49c092bda2ecc9dc96dbe394a1cda SHA-1: c04248d3d2894f67f949e4eb60d81fbf728172e7 SHA-256: c4bf89fdeb27cf7bc9b69e81eeb21ebaa5b0f1a232c78ceebfd7b5d7987b40d7
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and contains what appears to be junk data, further supporting a malicious purpose rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • 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://soxebez.ru/strik?utm_term=paul+simon+50+ways+to+leave+your+lover+drummer PDF link annotation
    • http://vovality.club/63598113083jq046.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/h0hcZje/raid_shadow_legends_youtuber_codes_2020.pdfIn PDF document text
    • http://allerop.xyz/update_windows_10_mtp_drivers_manuallyzh4xg.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/AjgSKhg/21284095499.pdfIn PDF document text
    • http://agencymedia-ig.com/49595936854x08cp.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/aha4Kkg/43988776349.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ijzhbii/fogemaso.pdfIn PDF document text
    • http://conicppjry.bid/dirt_devil_power_stick_lite_brush_not_spinning27mlk.pdfIn PDF document text
    • http://it50disconto.pro/what_values_are_reflected_in_your_daily_activitiesm2o59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_ab4da8bd837242baa02bdd1193ee18b4.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_15e6aad0c87b427bb707a292019f0647.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97972fbb-33eb-4776-8365-7970f1eacc8f/xibagigem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c453ae6-0d27-424e-8d34-5fe020341fb9/lenovo_thinkpad_t510_drivers_windows_7_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/44837780587.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/91603560686.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_ed3cdcc2f746486682ff941db1529c7b.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_e15c14e778734900b5404a98c5c1c18f.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_d460be6a38f549fc9586ece0b13826cc.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_327da1a9e5274764ba89644f131213f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3395d8b-faa7-48e0-8afd-f6ca432d8cfd/may_cause_miracles_day_1.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_af71fb35a08842c199272f59812ec4e6.pdf?index=trueIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_40e13af02ca4443c9baecad870d2e56f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/83536662083.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/25765462472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a39855-f7dc-4cd2-9d36-b573ee312c5c/92439987920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da0e52b-c356-4ddb-bf0c-71022e309441/advanced_business_english_course_book.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5492 bytes
SHA-256: 9c7357865ba5963c45bb4b31dcf6c5d243974de14adb4d2296c2200ad16b5776
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 11072 bytes
SHA-256: be548551b989e41c52f450b627c217818b493b0c8d1a57d2808e71c3e80071ab