Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7092aa3f02cb62…

MALICIOUS

PDF

76.9 KB Created: 2021-05-15 20:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 016b27b68d6abd3d528cd7f2930ac37e SHA-1: c173c75f0ebe9e4c8e4e42d988d672eadc631ff0 SHA-256: 6b7092aa3f02cb621c8468579820c00efa2f851dcd34c4b3886763d7850acb36
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were extracted, the presence of many URLs and the 'link farm' heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://cdn-cms.f-static.net/uploads/4408704/normal_6023f3b3d3bc8.pdf In PDF document text
    • http://guwugil.22web.org/fawujemapujotobepawavas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5ff1977e5577e.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/TfKtjfV/kanonepoxaviluvokejibuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_605fb87259589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_605a573134d68.pdfIn PDF document text
    • http://zinuginevero.22web.org/gana_achu_new_songs_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/ibajicu/general_hospital_today.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/jciigeL/voyage_44_catamaran_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/eohjFO4/47099339606.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/cidughW/reading_test_answer_delivering_the_goods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_600a4ffa03d89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=weather%20lesson%201st%20gradePDF link annotation
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_1188fe1dfac648f7ad7f18907033e4e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97888ba8-1f0a-4f7e-ba76-df3739735799/hampton_bay_e75795_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b11d1d-b772-44d1-8533-d8f71e8c029d/ladufiximimafelaxiruzavus.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_fe02c15e6ba64fae91dfb203575515bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/2002_ford_explorer_starter_replacement.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_cdb2fe603b10417e8a8a1ed63c729fbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/midpoint_and_distance_formula_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b410aa-2473-493b-95b4-36ac1dd361c8/sesip.pdfIn PDF document text
    • http://jebowozuguvufot.rf.gd/soromiwosidarezuludezolot.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/us_navy_chief_petty_officer_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153c856d-e9ca-498f-bc38-429cb37c7bbf/washington_state_unemployment_phone_number_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/51458789076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d612200-7d0f-47c5-8d66-9666b7bc0d5a/suunto_x_lander_leather_strap.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/palimifitakavofi.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_262748d4cf1f4d45b182cd59a7e63169.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5152 bytes
SHA-256: 747a945517e113b8f1e1da40f0c34a0a33ab18fb2560c9988ce2d7f8b57b802f
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10396 bytes
SHA-256: f5727e39eaf5e1ec560f6b6380b74417c7f0e5320819028e56d100cad3b27df2

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