Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c8d862e652499c…

MALICIOUS

PDF

83.1 KB Created: 2021-03-24 14:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e950e95be3193fc0a76f3bc9f5ef15d9 SHA-1: 9eb19cb89591d9ed0689f95f133f6b17867162c8 SHA-256: f7c8d862e652499c98b8561a2252de54b377737501a714a491652fc7fc119c03
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9994

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/strik?utm_term=baldur%2527s+gate+2+jaheira+romance+ending PDF link annotation
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/7fbe6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_605afbe7c7cef.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/a09ac89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_600925e0f25aa.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/jalobopefiweza-rilikubej-zeritok-xaxijomoxotabej.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/acb500eee3a.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/881011444cad54.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/86905810db4d.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/81e0852784040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6020b1d99e8b4.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/5ba82d.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/givopobaniwaj-gadadixotud-xejarosasega.pdfIn PDF document text
    • https://jerubezefago.weebly.com/uploads/1/3/0/8/130874212/dexifaludatadeda.pdfIn PDF document text
    • https://zejuraxarobepek.weebly.com/uploads/1/3/1/4/131407797/kimilabepotu.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/mapetasi_negafuvokanan.pdfIn PDF document text
    • http://didazema.mypressonline.com/lubewimazomilabatikine.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/92334c0c86aa.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/denuzofufom_lalekef_rabumabezidij_dusivid.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/baxofisaxu_tozimanodufanej_jizirenizipiref.pdfIn PDF document text
    • http://gililofus.medianewsonline.com/adobe_printer_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagijido.myartsonline.com/ancylostoma_duodenale_y_necator_americanus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9273a8-aaab-41a7-86b9-d67842386157/fikoxuxibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cd46fc-b576-41f1-b3dd-611f3914bfa7/ruwapokusejatezat.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_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 5644 bytes
SHA-256: 6d775772e3f91e407834c2a41647da19cf7d63c1257ab9c2186bfaabf18b5546
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 10576 bytes
SHA-256: 8729c1860a56616b568f897f2c0ec07f7a10342079ff376035fc3e3286490d5f