Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddf98c0444fc4f4…

MALICIOUS

PDF

85.2 KB Created: 2021-06-12 22:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf821b562073f1322220c5f2f9f717b1 SHA-1: e3f51326605da925b3151ec8e541b42f34a83bde SHA-256: 9ddf98c0444fc4f4e16754a352e4a86d3b0be03eea1a961eec1039163edc11ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains a reference to finding the height of a pyramid, which is likely a lure to drive traffic to these external sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/pbw?utm_term=find+height+of+a+pyramid PDF link annotation
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/059547cbb5d.pdfIn PDF document text
    • https://juvidefe.weebly.com/uploads/1/3/4/3/134319267/rewovudizade.pdfIn PDF document text
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/xofeku-ferofezil.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/gezinajopinutafa.pdfIn PDF document text
    • https://zevefexa.weebly.com/uploads/1/3/4/7/134727867/ralalu.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/sanunix.pdfIn PDF document text
    • https://vekibapovadivoz.weebly.com/uploads/1/3/0/8/130873848/1fdab37.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/87f8b1f.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/230929fcea9d955.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/lekuw-tazifa-josutazevimimo-rawuxije.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/gitixavaz.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/riforopaditedejuf.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/zirowofubopelopawog.pdfIn PDF document text
    • https://tipizilij.weebly.com/uploads/1/3/4/4/134462633/lebejanujovibu-nozujuwavokuzol-tubezagip.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/volazogosabanuras.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/9e4853f6-cc63-46e4-b5c4-331c2f8658fd/completing_the_square_differentiated_worksheet_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bffa3fe-188e-4ea0-b344-9b9c2638a4ca/should_lights_be_blinking_on_router.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/welcome_speech_for_newcomers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c0077a-bf93-45e2-909c-042eafed46dd/hundreds_chart_mystery_picture_halloween.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/145191939/32572963125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9021adc-da33-4158-a575-c911cab31d63/fidedawef.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/60679327092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c316444-1e4e-4dda-b24d-59544b2b6380/9152046494.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_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 5088 bytes
SHA-256: 236807bdcad1c0447ab86da65d0b23294b5d438f31d364fc8a2f364ca5ff933a
font_01_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 11116 bytes
SHA-256: e6f8771720856b9d43af9a7b1089e618ea40f13f84acd913dbed52c797253a00
font_02_sfnt_off000138dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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