Malicious PDF — malware analysis report

Static analysis result for SHA-256 87449a98d549ef32…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 19:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b5ae5ff61202b0e0ce9537c9c064dc04 SHA-1: ee8e016014986c03c1f6adb676891f532c2d3560 SHA-256: 87449a98d549ef32e54343a97d32ffa24ad0be4f019f2759211b6bf81c244c61
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=indefinite+pronouns+exercises+worksheet PDF link annotation
    • http://derilezin.sportsontheweb.net/gamuxuda.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/effects_of_alcohol_use.pdfIn PDF document text
    • http://tewajaz.iblogger.org/trigonometry_review_for_calculus.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/aicha_paroles.pdfIn PDF document text
    • http://aov.one/gipalizokikufaxiwew90ocm.pdfIn PDF document text
    • http://questotzvezd.space/74385560434oke0j.pdfIn PDF document text
    • http://xopijodujakik.22web.org/mobogenie_for_android_7._0.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/ludujidujobamus.pdfIn PDF document text
    • http://fazojum.66ghz.com/fupuwolopobopibi.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/72d962c1-f8b2-47a9-8beb-8a94a48901ad/what_to_get_godchild_for_first_communion.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/zugafolegukobalugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3458add-9a3d-4f1f-911e-95f52915e370/2016_vw_passat_transmission_fluid_change.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_ce13e0827a0a4509b9161df872b62356.pdf?index=trueIn PDF document text
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_5c8800f5827541dea6cce651ff0dfa31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/how_to_effectively_stop_smoking.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/59823297869.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/how_to_draw_a_dragon_realistic.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_8fccc5a685f3482dabe85790ab63c711.pdf?index=trueIn 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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 5044 bytes
SHA-256: 16d41e731eebe2d267dbb58a67137094be390a00002ca4ac56f27c44d61ffeee
font_01_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 10912 bytes
SHA-256: cc3d573e6c8cfa167b9d64ed193f55c2fecf6f7834353f13df46973c737be50d
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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