Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f989a5eb8f18d2…

MALICIOUS

PDF

131.4 KB Created: 2021-02-02 02:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42aa84a1319171763e57ceb1b8563691 SHA-1: e8e58dbfabbdba4861217ff77a0d5183affc1cd8 SHA-256: a3f989a5eb8f18d2d7018168bf0685ec08f8a1fb494232560bd3dbd38f1f288e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains a URL that appears to be part of a search engine optimization (SEO) scheme, likely intended to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/aws?utm_term=maa+durga+bhakti+audio+song PDF link annotation
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/kaparowanulixaneni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_600647acca37f.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/boAc8ie/descargar_crafting_and_building_free.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/4608466.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/3534289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_600bc8e89e8a6.pdfIn PDF document text
    • https://sivekilupikuma.weebly.com/uploads/1/3/4/4/134491743/47527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fd6780862015.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/57b74ea982.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/e2f035c53bfc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5fd33357d7fe7.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/eRuijT9/bivexanajunapof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_6007a6a8ef0ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_5fe5982d5ccb5.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/xiwevitox/77427420745.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/best_friendship_song_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/82514633621.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_off0001bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCB9 5028 bytes
SHA-256: e29a2b18281aa7a6fda05fbcb95b6749d6a95354db08e2e285515aba5aacc26e
font_01_sfnt_off0001cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDB8 11044 bytes
SHA-256: c7fe447b140bb2a84790162450fa10f1bcc64699aa6928371ddb8d763527b1a2
font_02_sfnt_off0001f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F292 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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