Malicious PDF — malware analysis report

Static analysis result for SHA-256 0868780a2f312ee0…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 11:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8448808707616b4297b47b99bac6a531 SHA-1: 8fdf9022ab57f852ac6c77b809a5d0a65d3b3d1b SHA-256: 0868780a2f312ee072a4337a19b67de04f20e88c054c7ecac61026f0dcdfca08
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/wix?keyword=the+book+thief+comprehension+questions+and+answers PDF link annotation
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/moruke.pdfIn PDF document text
    • http://fartook.online/arc_hydro_groundwater_tools_freel57ng.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/vadusotop.pdfIn PDF document text
    • https://jareruko.weebly.com/uploads/1/3/4/3/134348829/bbb7eb44579419e.pdfIn PDF document text
    • http://startbastar.online/crenated_tongued2p4e.pdfIn PDF document text
    • https://topekaje.weebly.com/uploads/1/3/4/1/134109010/993415.pdfIn PDF document text
    • http://themarkuzmusic.com/best_way_to_tie_a_fishing_knot_with_braided_line8y534.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/3980956.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/7778567.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/28448.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/vegikig.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/fc89ea.pdfIn PDF document text
    • http://front-glass.website/poweziredomugebigobuyeff5.pdfIn PDF document text
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/milenu_dupasojug_kuzarowakoze.pdfIn PDF document text
    • https://xumexutibivuw.weebly.com/uploads/1/3/2/6/132680998/safezujukel.pdfIn PDF document text
    • http://fb-pageunderreview.com/ronafifarag3eldd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/79782432671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32337814-8b88-4706-a05e-1240a55d79e3/my_cloud_os_5_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2da5c0-3146-4a86-b4e6-63b26de90cd3/seluzupobatoxub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8bfba6-c9c0-4099-8fd6-5be3403e1445/kotekugibebed.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/wallpaper_bedroom_design.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/gate_mathematics_syllabus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 5732 bytes
SHA-256: a71cbaf6e64d092d951d0f1a4dfb41b5a8f7df551b7c5be4a5dda44ef1d118bb
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10620 bytes
SHA-256: 6d38cd1628c68df9e76c541e129e1aa5dbb07a6260410c889f33f2488fdd1541

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