Malicious PDF — malware analysis report

Static analysis result for SHA-256 575395bf6d1fe912…

MALICIOUS

PDF

82.1 KB Created: 2021-05-13 13:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51e28ac3e8829fc26da88a6349a1c6fd SHA-1: cce98c187aed79733dbe796acb53b569270d01d0 SHA-256: 575395bf6d1fe912f2896ddf52c4de54fc8ce38070368d915fd7ddfbbf6e9083
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=what+are+the+elements+of+instructional+planning PDF link annotation
    • http://dayzcommunity.info/what_is_in_margherita_pizza_saucezker1.pdfIn PDF document text
    • http://medway24.com/bebufurilibusosqanz.pdfIn PDF document text
    • https://cdn.sqhk.co/ninevowa/dhgjaNN/60043741859.pdfIn PDF document text
    • http://esmoney.site/stanley_garage_door_opener_parts_diagrams0kq6.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/jPA95oa/best_religious_apps_on_roku.pdfIn PDF document text
    • http://hook-up.fun/93334765470qomnf.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/gfd9ggX/how_to_use_activity_launcher_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/hgeeRGn/shooting_games_for_nintendo_switch.pdfIn PDF document text
    • http://medway24.com/motorola_ht1000_for_sale8eg01.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/Ot1geGE/konarivedezizofum.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/daf40d58-3b16-498a-8cf3-50dd377e91ce/tinaliwusaran.pdfIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_ecb4c06b21604940a66d050c17905432.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4834cc-9477-4f3e-981d-e59f16f463e8/bilebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7c7ec9-c62d-4aeb-be1e-6bddc3c5631a/gatowirenanivumexol.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_b3ad022bec1d48a097ccc26a68766812.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_75999421a9d443f48b76d4cfad5f25ad.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_8d33d187bd9d42f39c74087c96f9e812.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9940cf-87b9-4067-89ff-df58d1a530bf/why_does_my_chainsaw_leak_chain_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2d33b1-8d4c-4ff7-bc25-a23f85646760/best_jane_austen_movies_streaming.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_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 5444 bytes
SHA-256: 16c75cab628476e983d5f657a6ce230e0b70076f3a17b6f25d0f1b80143b06fb
font_01_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 10672 bytes
SHA-256: 907886827db57fa01d0bf721015845b30939534d23e77811eff2aee6c3375a71

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