Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5db4e5d7c7eab13…

MALICIOUS

PDF

86.9 KB Created: 2021-05-10 17:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc57ad3d604a97c07143bf4ea29a1066 SHA-1: 217283ac728aa9b6ea99f19da8ccfeaeac94a8ae SHA-256: e5db4e5d7c7eab137e06206390f1f8da0a45337c29e0adc960c56d7871fa50d7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a tactic of redirecting users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=how+long+is+the+mockingjay+part+1 PDF link annotation
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/tojizigukif.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/67063643416.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/5226234600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fe84e8129782.pdfIn PDF document text
    • http://towajemikof.iblogger.org/fazufesevajewifekako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_606ca0f887168.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/nevibebe-buzorom-lopivujenaso-kojirulepel.pdfIn PDF document text
    • http://zanupolema.iblogger.org/lozadovebonogovazivisike.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/7d81d6df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5febc873b5b76.pdfIn PDF document text
    • http://punevufazeji.iblogger.org/tiketijitozulalo.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://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_b67ac7146420480fb43132295c63651f.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_8d3f40ebe2b744618318cbb4540807cb.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0be7b704836f4b04a5d1d30bd9322b23.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_0025f1b119db446d8665fcba478dbf70.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_11748156e7e54c82b2ce8aa717e688c8.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_231ad783261940ef899bc7d5389d7fa3.pdf?index=trueIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_d3b448d0243246f08bf7e23c7401fcb7.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_c265addc6da04eb8930ca0e47120a010.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/video_converter_to_audio_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/apple_watch_buyers_guide_2019.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_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 5484 bytes
SHA-256: e6330632690eab7a6e337bd9240dac13da56a9843452aebb25211af6e480d541
font_01_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 11376 bytes
SHA-256: 127d7125de30a7fe6d020bf4efb2401b921be2d7d86450f17b2266ad283bbf61
font_02_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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