Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e07a95fc88f504…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 00:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bbe254767f41328ad7b371dbc1ba2be1 SHA-1: 24287a82ae09242b1b8282127f2f7f78a2755f78 SHA-256: 31e07a95fc88f50460a613278be857dcc2050db1f891568b01575a4acb08fbb0
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://ponafet.ru/award?keyword=barron%2527s+gre+22nd+edition+pdf PDF link annotation
    • http://dubiniba.iblogger.org/android_studio_default_sdk_path.pdfIn PDF document text
    • http://qunit.space/6725316572693s89.pdfIn PDF document text
    • http://homeolimp.com/92394733905mt7ei.pdfIn PDF document text
    • http://storezone.info/sefezadivefug5dwv.pdfIn PDF document text
    • http://fherixq.com/heart_starters_sioux_falls15trv.pdfIn PDF document text
    • http://myluckywin.site/103843368552e108.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/47a48a23-f818-4dba-83c5-334f107003a3/3675782285.pdfIn PDF document text
    • http://wasalesex.epizy.com/loan_interest_calculator_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494000eb-9993-47c7-a0dd-5a342b91bc81/94819755219.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/todivafufavejoxijawir.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/33872516185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24395021-a57f-4967-b375-d1b9e112343b/how_to_put_wahl_pet_clippers_back_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e0e5fe-0405-404c-956f-d7c7655955f0/17727140633.pdfIn PDF document text
    • http://xeziribosivamis.epizy.com/47627502851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab374c1a-d491-448d-8f41-8b38da5ac9c1/16136957865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e083b2dd-6e46-4678-894d-eb49f568fe43/how_do_i_setup_my_netgear_wifi_extender_ex6120.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/68573115574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807af31e-20b4-4fa8-95d4-fa7d8cd339d9/kumalutagaxobatijodafoto.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/drama_beautiful_reborn_flower_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc49d0d-4eff-401b-a8a8-ab1dfd37b148/words_their_way_spelling_games.pdfIn PDF document text
    • http://tixenolas.epizy.com/19594334289.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/1512781525.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/avast_safezone_browser_free_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/wilderness_and_the_american_mind_summary_chapter_by_chapter.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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 5392 bytes
SHA-256: 5a1ce6080bed5fe43bf6977151d8946252e112e4624dd5b431a2ec0312586642
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10416 bytes
SHA-256: 3a8b1c33ce3273f2740469ce735f923154e164726dc6617aca537efe7d4d5725

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