Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52365fc0052be6c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 07:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4a8cf70a17c62e5ade7d74d0f9d9c2a2 SHA-1: 9c559de8f8b1058381457a366554a7fbdc0da3b2 SHA-256: c52365fc0052be6c9e61d12f99106d7715418e0c376a565bf38b19075b1944cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to http://dipagepe.atwebpages.com/32978375513.pdf. Additionally, an embedded URI points to https://jacksth.ru/wix?keyword=unidad+3+etapa+2+actividades+para+todos+answers. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=unidad+3+etapa+2+actividades+para+todos+answers PDF link annotation
    • http://agent-ritual495.online/vampire_diaries_books_or_tv_show_bettertg08p.pdfIn PDF document text
    • http://artistichomesolutions.com/ap_statistics_book_answerswhk03.pdfIn PDF document text
    • http://semengergel.ru/bhoot_fm_october_2019szrrs.pdfIn PDF document text
    • http://specrazreshenie.com/veer_zaara_trke_dublaj_indirmhu20.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/how_full_is_your_bucket_video.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/5e790b.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/povopolevemuzo_tivogugobajelo_sinaleduxo_lodogetepusemis.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/2767901.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://dipagepe.atwebpages.com/32978375513.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/hp_elitebook_8560w_wifi_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/95515724753.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/fufopogoxakedok.pdfIn PDF document text
    • http://fomepufasele.atwebpages.com/best_order_to_read_kurt_vonnegut_books.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/baxawapuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/pexezisezulija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef70aa22-6687-46d2-be61-a3eea9f5828f/can_you_replace_a_battery_in_an_ipod_nano_4th_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/can_itunes_work_on_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8323aad6-d132-41b8-9f6a-4d2539a77b43/pajofitizazuzutaxalofido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5264 bytes
SHA-256: 8fba099d7ffb074a7688e88373eebeb8fa7f684bd833c27d40d1abe9c4110557
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 13128 bytes
SHA-256: af9041c3af11ccf763d7d3b0c88565a015e64ae2397c70195afa6d762958b96a
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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