Malicious PDF — malware analysis report

Static analysis result for SHA-256 b992015e6d54b8e7…

MALICIOUS

PDF

155.1 KB Created: 2021-03-16 21:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc9eef988f1d8cc2257e081f9f3badb0 SHA-1: c9cfa479ffd409423cb1961129f7c6fa0b079392 SHA-256: b992015e6d54b8e7bd51001a235c2f04e6d0a124a23326bcd466abdfd810f6ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=dragon+ball+dokkan+battle+jp+apk PDF link annotation
    • http://strgb2.ru/44929034211jowex.pdfIn PDF document text
    • http://instasurprise.online/motosizaxowibiraxuxo843oq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_602d7fb2a0be8.pdfIn PDF document text
    • http://creditreportfast.info/gawinorafijasinajxy7c.pdfIn PDF document text
    • http://generalmassage.online/nujugafixubiziboki2d2sc.pdfIn PDF document text
    • http://wisitens.online/xesonopeahigq.pdfIn PDF document text
    • http://cyberlife.store/today_s_weather_report_jammu_katra4uelc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_6027c178ce9da.pdfIn PDF document text
    • http://santecmb-sarl.com/nursing_care_plans_diagnoses_interventions_and_outcomes4wlee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_604eda66339d7.pdfIn PDF document text
    • http://in-arenas.com/data_structures_and_algorithms_python_textbookvegnj.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/5894bed9-c1e6-41f7-a30e-e42d3df7870a/are_wow_private_servers_worth_it.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_cd3daea5ba124f3c9789caf468f89b10.pdf?index=trueIn PDF document text
    • http://fizuvofodiku.epizy.com/wii_rvl_001_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d34d37f-2c90-4bc1-9925-f3d9c9ace2e4/8710115442.pdfIn PDF document text
    • https://f30ce2b2-68ef-4482-88a1-1c46bf3d34f5.filesusr.com/ugd/bcd086_98c6319c8cdf474aa16d2e5f05273bff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8f7be5-2938-4bcd-89cb-ca8c68c3e884/bagebikisipolumetikibijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2dc214f-64e8-46bb-aeab-0ba53384a497/2150775627.pdfIn PDF document text
    • http://daxotumolurotaw.rf.gd/du_b_tech_admission_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010812.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10812 86868 bytes
SHA-256: 78af354ff4c01f39ca68a84ef8189a0778179aaf78dd47addade3c5ba2affde0
font_01_sfnt_off00020c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C93 5228 bytes
SHA-256: f9d554ce8db455a5bebff413e41659e78ec6ba502ddc2575ac7e363f7acaea66
font_02_sfnt_off00021e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E72 11888 bytes
SHA-256: 0576d06d3c11df378a5451af96fef5a8850648ee224e7a302cbbbfff3e5ef054
font_03_sfnt_off00024757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24757 16248 bytes
SHA-256: fbeccb1482ee56052ed809ec6cb7dfbc577d51b9212e43fffabc93e29761b6bf

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