Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1bf425d4ba848d…

MALICIOUS

PDF

90.5 KB Created: 2021-03-08 13:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6c4a66cc16a2f4d266757fc5600530e9 SHA-1: 59f8167884829c9102954e92aadfa3b3a0740083 SHA-256: de1bf425d4ba848d0bf490df254bf867c54683976b24e01d9695483ee817413b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/wix?keyword=brocade+switch+types+and+product+names PDF link annotation
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/1457207.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/a277e8c9064.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/lejodipe-pezuwiwilu.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuwesuk/hhajasr/53614933101.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/jj8SijM/kuxasivevun.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/dolorimef_lozibikadugos_xolobewa.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/hdLfr1L/kazoxipujukelozix.pdfIn PDF document text
    • https://vuguzazevuzuk.weebly.com/uploads/1/3/5/3/135316601/vabujipi.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/vegas_pro_free_16.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
    • http://xizokokov.epizy.com/miwusoze.pdfIn PDF document text
    • https://edf6f6ec-8a93-4ac2-80af-f76282245ca6.filesusr.com/ugd/738632_85209a54cde6415eaf4c415d4791cceb.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_792874dc6b3a4c66bba85a91f47e01c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19856117-6d19-481d-8042-a0a8a52d7a2b/mejimolakigumuwizori.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_4fec357166424f009e6e359fa06192ff.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_5b70516d7b8e4e94b468e3c1cb565110.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a72dbd-30f4-4ef7-9c61-16f7a140a599/why_is_deterrence_better_than_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4208206-afc6-442c-a00d-e91febc8e7bd/how_do_you_make_bow_ties_for_dogs.pdfIn PDF document text
    • http://jigaxobipufita.epizy.com/kozabusixove.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_da5e63c317f145538ba9513df18ce43d.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_380954244ef94153b6f1e494c4929ca0.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_27c765cf60444989bf3e1191f36f4afd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0251ce20-282b-48f7-9593-6514a75f2b1a/32102619058.pdfIn PDF document text
    • http://vorasatijede.rf.gd/asus_m2a-vm_hdmi_motherboard.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_a38a66232f7a4ba9ac977589335988c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e811399-9fb8-4b88-b7ec-8b336f69d604/wurawen.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_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 5404 bytes
SHA-256: 5b9550886fb31054c12471d7f01a780e05cb1eecf889e26bf01bf017902de2aa
font_01_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 13064 bytes
SHA-256: 1bf78b45e7081876dae9c4d9e31889eaed4f366eec90240919a77f1e36ec279c
font_02_sfnt_off00014e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E09 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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