Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8253b02d29c5004…

MALICIOUS

PDF

80.6 KB Created: 2021-03-05 04:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c2a6f2bb5becf80035f7e9708aa42b9 SHA-1: ada92f0d478ba6af91b20f5c7a41af3bcb9747c4 SHA-256: b8253b02d29c500465e8c589bc9212e9e176d3e2f52dae51c14685ba40a5fe3d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, appears to reference academic material, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/award?keyword=schaum%2527s+physics+for+engineering+and+science PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/xavanuvekukekuzefaj.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/84069513964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcacf021dc66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fed5f1f44806.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/no_fear_shakespeare_macbeth_act_2_scene_2.pdfIn PDF document text
    • http://negozio50sconto.info/35820997482a25ps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_60170931a6e1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_5ffc81fd157f1.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/gjggihP/asa_security_context_license_failover.pdfIn PDF document text
    • http://7gusevshop.website/thematic_content_analysisuedos.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/hcfL4cU/gibukijuregajifomutiza.pdfIn PDF document text
    • http://lisifakus.66ghz.com/20809917571.pdfIn PDF document text
    • http://zoo-taxi.site/whatsapp_apk_mirror_2._19._282ychh0.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Lhhiajb/globe_prepaid_promo_for_one_month.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/3e8b7b6d-0d35-4da0-90d0-768d56f3fcfd/61978510948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1882187-ed94-4858-9a0f-1eeb2958d317/luzinazuriwawutofupobab.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/calendar_template_september_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9622e7ed-c5c3-4f1c-866b-2b762b899e43/encyclopedia_magica_dd.pdfIn PDF document text
    • http://wagupamodesugub.rf.gd/wekogodupemowagureruvule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80d4941-754c-4f51-be38-12b98e8b35bb/34539494309.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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 5580 bytes
SHA-256: 10695405bb14ac73dc2c1c7125fcb8af139428e14d980c0657030176a9974606
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10604 bytes
SHA-256: a12dcaa8237c135c7622bbfd1dc89c1ca8466d16723e27f68ad84fa6f786e091
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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