Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c13060f4f9035f0…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 09:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7e5eddaff0d754089d7530625e2ad0e6 SHA-1: ede3e52b598dc3b1609ffd692612d8abd85126cd SHA-256: 5c13060f4f9035f095a512b7152e4762c65df56ee466825b500866c9124c67bd
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL, 'https://gimoguvi.ru/strik?utm_term=why+is+my+furnace+humidifier+not+working', appears to be a lure for users searching for technical support information, likely leading to phishing or malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=why+is+my+furnace+humidifier+not+working PDF link annotation
    • http://duzatizej.iblogger.org/styling_action_bar_android.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/6060301.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/fgcsEhe/noah_bottle_mod.pdfIn PDF document text
    • http://chempion.coffee/tewedzfjuc.pdfIn PDF document text
    • http://afracheat6.xyz/laturiwotutib79dda.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/igiblIq/12199283710.pdfIn PDF document text
    • http://sysfix.ru/33948754668d2wof.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/piePohd/supportive_housing_for_the_elderly_program.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/dojdJjh/faith_city_family_church_live_stream.pdfIn PDF document text
    • https://zuragebemejopiz.weebly.com/uploads/1/3/4/6/134633408/bigor_woxepojo.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/SifQqSf/screenwise_meter_android_11.pdfIn PDF document text
    • http://topetutodo.iblogger.org/best_to_dwg_converter_online_free.pdfIn PDF document text
    • http://appless.space/award_ceremony_programs_templates0oim7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_4076eb0eaa7449e7a61e4ca013e78dee.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_2523bc06b1ae431cbd56e8c8fb8928ff.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_753b38442d464a88b39b0c13d21554ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11781027-6ab0-40b5-bad5-7ed0ad276d39/what_do_painful_bloodshot_eyes_mean.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_8982cb108dfd4d94ad1fdbafa7cf4e50.pdf?index=trueIn PDF document text
    • http://filazit.epizy.com/32520858319.pdfIn PDF document text
    • http://mixonanax.epizy.com/88654317065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3966362b-de81-45e2-b7a0-8bffbe9ca656/yamaha_av_receiver_htr-5730_manual.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_94bffa018bc144e29d062bc7fdbf826c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a70e9c2-2857-49e1-a42e-72db330546e1/69107345153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a88344-2131-4986-bb6f-c29a330e2be5/oxford_english_grammar_course_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd07249-24d3-4667-be8b-8dcf2d78779d/65452094875.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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 5676 bytes
SHA-256: d9152042251ca54971351db980b022cae0409cd59caa19d06ac2fa936ca4e639
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 10912 bytes
SHA-256: d501ca46c4c7c81c10a273a46e84906b0ced46336bf71217776b942cb242dde6

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