Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1936487ecbc306…

MALICIOUS

PDF

91.8 KB Created: 2021-03-27 22:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0085e4d3478b66898b8da609d9abecf5 SHA-1: 185f36d753dcd196ad4b8c8a73a02eb1378e1c1e SHA-256: 4a1936487ecbc3068294cedfd7c3533bec2dc228381f7da31f53ef831b9fe3a4
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 content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document.

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://mezovuduw.ru/aws?utm_term=face+proportions+3%252F4+view PDF link annotation
    • http://giwitap.getenjoyment.net/do_the_numbers_555_mean_anything.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/faxofabidubafav-mujawidixofibud.pdfIn PDF document text
    • https://vimasideb.weebly.com/uploads/1/3/3/9/133997972/6275099.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/2429505.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/6653206.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/15487d0ae70.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/11028258475.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/wavezinopix.pdfIn PDF document text
    • https://jowewuxutezu.weebly.com/uploads/1/3/4/6/134632231/fekejopogeter_zaniseg_gubifop_jekategivuwegi.pdfIn PDF document text
    • https://vosifiteke.weebly.com/uploads/1/3/6/0/136049758/0243b.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://s3.amazonaws.com/nonipesikiri/how_to_describe_rain_smell.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_ebc48c50a8684c9095743df1885f954f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3c7ea4-4def-4ff6-a641-42bf22f08e29/27090344486.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/cambridge_international_as_and_a_level_english_language_coursebook.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_cc77c38cddaa46d9865936cdb34146f3.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_2a9dee7d879f425c8383bbc137fbce98.pdf?index=trueIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_5ad5bf2a8c2d4ae6a1e294791fc4abcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/netefazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45814405-8d43-4032-b4a7-a64a087df49f/xatijiweked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec25032-d07a-4e55-9ef4-7d1090172d6d/wndr3700_router_ip_address.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_8903f40ae72c40eebd4b455b2fe8e890.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/disulfide_bond_formation_kinetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e54b25-36e5-4c7f-8490-7d59675ddb5c/latest_news_on_india_china_border_tension_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/kawozozeradofelugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/doctors_note_template_reddit.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_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 5080 bytes
SHA-256: 6d84b513376696a753a5d69bb607557f43706bf59815db187185b4b2e6ccfb02
font_01_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 11156 bytes
SHA-256: 898c767681d8afde66650d58c7db0f8ee1c8a20a6f65c534b6b58a15a4776915
font_02_sfnt_off000153a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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