Malicious PDF — malware analysis report

Static analysis result for SHA-256 e400becbd00078ae…

MALICIOUS

PDF

84.5 KB Created: 2021-03-04 23:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d323fe19e0e77f9c74b6f55087fe9a8 SHA-1: 6190a38fca08b7268736b9b098de867750d6501a SHA-256: e400becbd00078aedf74bcc71e3b53aa119999f0fcb51291660aa5aa531bdb1c
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous external URLs, including one pointing to `https://leonvi.ru/strik?utm_term=why+does+my+cordless+phone+beep`. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=why+does+my+cordless+phone+beep PDF link annotation
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/9305833.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/cvhdfdT/wezinalabupexeruvubafoxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/Fjge3ZT/anesthesia_npo_guidelines_coffee.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/j4nQXhd/sisuzisebevigevij.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/Ngdibgc/simple_doubly_linked_list_program_in_c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_60137d343f956.pdfIn PDF document text
    • https://damuduwanilew.weebly.com/uploads/1/3/4/4/134477354/2189198.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/dIhghgf/racing_fever_moto_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_601f11c022a1b.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
    • https://uploads.strikinglycdn.com/files/603a0010-b951-47cc-b3ea-f798e957a9ac/67787391380.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/garoboxoxixapubuxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60617972-080b-455f-87d7-c1f105a21a98/didowuraguvivoto.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/far_eastern_group_annual_report.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_64c164c200234130b339a8a6568ee04d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/64456695675.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_219393c1615244eca7106e9729cd433d.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_51f083eac2ef42f8b6e6c482b55ecf3e.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_e84e5475d97048b89f3359bdf33d4618.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0637a6ce-1cf6-4567-86b1-a0a9d8351b38/bakeguvigexugogato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5c3588-830e-4f87-a7af-256794207b34/how_to_tub_clean_lg_washer_dryer.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_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 5020 bytes
SHA-256: b5c73c22f9176ceddfad7e48202e7ba93cdbad1077c0a6af176ef282764b2552
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10272 bytes
SHA-256: cb57872a708c89564580a5df81c3213754ee5aa858010cb95aa99e30c8b56e6d
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.