Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4f276961afc5ef…

MALICIOUS

PDF

73.6 KB Created: 2021-05-29 10:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 63606f1c3b3fe93ec468e7fd7e5b1dff SHA-1: d92ab0a37e5dcf61764ee564b29d734acd88f04c SHA-256: da4f276961afc5efdedbf3d4b114eaabbc216593ca4ecf9c04ee062e78f145aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a malicious payload. The presence of embedded URLs and the overall structure point towards a spearphishing attachment.

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 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://pelibifir.ru/123?utm_term=australian+passport+renewal+online+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fcf1f997c60a.pdfIn PDF document text
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/kutowu-femiwirufoxos-vavim.pdfIn PDF document text
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/8241514.pdfIn PDF document text
    • https://vatozuserivowi.weebly.com/uploads/1/3/4/3/134385792/fulariwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_5fda643c40047.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/fukajukivuj_raduputexikil_gozatef.pdfIn PDF document text
    • https://pukaxixuzex.weebly.com/uploads/1/3/4/4/134492253/xirepalagididov.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/kafinediwunotafu.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/netirunorenopepob.pdfIn PDF document text
    • https://lajukigoguxozu.weebly.com/uploads/1/3/4/5/134529026/disigenifuvisu.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/zawozubejazuxisaw.pdfIn PDF document text
    • https://niwegokizefofiz.weebly.com/uploads/1/3/7/5/137513185/6985859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_605cf09c27447.pdfIn PDF document text
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/kezejudod-pebezewiziweb-gowipanedore-filuvoxina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47c1224-d6ff-492d-a9fb-f4c9f0c250c4/natifumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6502efa9-079a-4916-8cb3-9f96c350c14b/65913193997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f79814-3979-4f46-80ef-03e88037273e/ion_air_lp_bluetooth_turntable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689c36be-9b82-45c6-b7f8-167064dbf01d/how_much_is_it_to_get_your_dog_certified_as_a_service_animal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36178750-e2ec-4b97-ad8d-2da0a45ea281/holt_handbook_third_course_answer_key_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ede59e6-8876-468b-a5ab-83a21f4ddc18/tebaguwojodimovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f1a6ec-12fb-403c-a0e9-2c24d86e2c36/tinomowaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e3bf4a-3d82-4bf9-abd1-75bd5ee0fc58/51735642398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169c00cf-b5e6-4d49-8c39-6e0fcd3552af/dell_latitude_e5500_release_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18e20d8-c999-4781-8176-91ffed22baa3/30722407624.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5128 bytes
SHA-256: 14f066d6db5b1489c0dbf176ba42a5fb42742bddfb1d1ac28e9fcce920ce39c2
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 11804 bytes
SHA-256: 1f7214bf8365ca54ddf4c5f69d4a0761b8ba8ecc0a2b36449e3aadbae3074549

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