Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b2a47f2f8fda41…

MALICIOUS

PDF

70.9 KB Created: 2021-02-12 19:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2fc913e9e43120193f7f0d6d2f7853a7 SHA-1: ce58ddd5bf45c73d22d493df742bb3af5df66d18 SHA-256: 73b2a47f2f8fda41bb5abe733f9071ab610271ec63c71bf0bb41a7f804b20812
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links pointing to disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure further supports a malicious intent. While no scripts were directly extracted, the structure suggests it may exploit PDF vulnerabilities or serve as a dropper for other payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=buffy+season+9+complete PDF link annotation
    • http://bupro.asia/54484186436ekj3w.pdfIn PDF document text
    • https://xanipopig.weebly.com/uploads/1/3/5/3/135345317/3664831.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/96a42697a672.pdfIn PDF document text
    • https://gefogujuper.weebly.com/uploads/1/3/4/0/134012332/jigokisisixufan_gilujidap_lovovovi.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/difarajoxuzop.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/jizizife-zovigexilodera.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/vuwofemu_kesuno_naregofuguga.pdfIn PDF document text
    • https://remafubununabex.weebly.com/uploads/1/3/1/4/131437283/joseliz.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/9811b35c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_601b18138f614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fec921189b29.pdfIn PDF document text
    • http://myfoxing.online/amtrak_schedule_changestzak6.pdfIn PDF document text
    • https://lalotuzeguraja.weebly.com/uploads/1/3/1/3/131383936/2417482.pdfIn PDF document text
    • http://salearea.pro/37381782830umsjs.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/61a2712b.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/QjihjaK/81212818322.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/b1e660c8fdf5b44.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/df8222a740de91.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/i3jdhgY/10220845516.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/xewumurusojexoziru.pdfIn PDF document text
    • http://levantemosaic.com/axbridge_first_school_ofsted_report5218s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 5372 bytes
SHA-256: 91838400d656b2c0fc800a4dc83a063553eee50ebdf507e2fb6e5f3c012bf28f
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 11060 bytes
SHA-256: ac11a9907e1b0da06500449d9bec2220ed344da27d92dd2a8ab50b6a5b16f706

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