Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ef112620947123…

MALICIOUS

PDF

79.0 KB Created: 2021-03-05 03:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a14098b644f22c3b907540dd1b808d5 SHA-1: 81a2e3478d398f183a7732346c9942e1555975e2 SHA-256: 55ef112620947123002a6aabbdd9b421f58efcac67ff4a596ee45904e8ab7d79
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URIs, with one prominent URL pointing to 'https://pelibifir.ru/123?utm_term=download+twilight+full+movie', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+twilight+full+movie PDF link annotation
    • https://cdn.sqhk.co/tukawezezo/jUjajhi/vufifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5fdde2c2d35d6.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/the_journey_to_the_east_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5feb342735a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_5fe93e3bce09f.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/nikon_prostaff_rimfire_ii_3-9x40_bdc150_amazon.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_adjust_noise_cancelling_on_beats_studio_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd619ff6ed0b.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/iexbbwx/texas_longhorns_college_football_schedule_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/CgghduE/43488061349.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://gipebevu.atwebpages.com/how_to_troubleshoot_performance_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c6d04b-97b6-46bb-9806-84fe6ccba014/does_yennefer_have_elven_blood.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_fee2352d308040fba1d50d97795a1d16.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_b173498495dd4427a3d8aa0b35c5c067.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d622dc7d-429a-4e3c-9018-5197d557136d/what_is_meant_by_reimbursable_expenses.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_b1c91a6882154241a6618972cbd3f64a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e63251-9fcf-4fad-a6e2-e79bc465f86d/the_gray_wolf_throne_summary.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_f6f91c8ed0d74954b58d1f56df159d3c.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_8fb093642141402ca24ac099e3769b33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ebdff4-934f-486c-90fe-f17ff5e80903/6886553869.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_e2b6d1df31e24854a155c23cda2abb8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb86cca4-3691-477b-8146-5b74e558052e/frigidaire_ultra_quiet_plus_dishwasher_manual.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_4ff3fb4e207e47dc8f66bf484f616555.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_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5080 bytes
SHA-256: b8cfdd1c415701c2a48f5c47837c975a127fe047f9e76cae2ae6a499339c8e5f
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 10268 bytes
SHA-256: 8c8a81efd899bada0c25115e19e604732f264c6d1dc61431e5e035484432da6f
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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