Malicious PDF — malware analysis report

Static analysis result for SHA-256 286d931276303bf8…

MALICIOUS

PDF

145.4 KB Created: 2021-05-04 02:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9cd701d63fe3c360942e13b118128693 SHA-1: 7166eeb7ab6662c95e12a5f323fb8f3aed0ace3d SHA-256: 286d931276303bf8d80244859ee2d066f9700ef8f49fe68e89467362f05017cc
134 Risk Score

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. 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 0.9985

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 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://seumenha.ru/strik?utm_term=ffx+blitzball+guide+gamefaqs PDF link annotation
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/nuvexux_gomufuxorulexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6003bd0c3a71c.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/xIEuMij/warren_city_ohio_water_department.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_5fe76ecf87b09.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/62da42f5b.pdfIn PDF document text
    • https://kawapojironene.weebly.com/uploads/1/3/1/6/131637385/xuranuboxikego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448995/normal_5fe4ec649fba2.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/aef002a0e499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477183/normal_602f01757be41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_60292643eb965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_604fd26224f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/pWp4Kzf/guided_meditation_ego_death.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/dujen_tatef_lasifosiliguwuk_vuseze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6050a6ef31731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c1ff19-9bca-49d0-b1a4-e46d438ca84c/92642554098.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/1273587313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80e11ec-0d0a-43a4-ad2e-a364b2d01661/wirujigepozibagowanubal.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/clasificacion_de_cuentas_de_activo_circulante_fijo_y_diferido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7512aab-ab49-478c-be74-a80da29d57eb/verukajobajix.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/phrasal_verbs_in_english_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/142677974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2503bab-022b-491a-bbdb-59c3a2ec5d95/47627977441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebc88f5-99a0-4694-be20-befc3170b6e2/rirewuzadanafes.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/what_is_the_meaning_of_dog_poop_in_a_dream.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_off0001c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C851 15792 bytes
SHA-256: 1707978087c3931511962c6404cee73c0d128af8df0a3baffd61081340dd7a61
font_01_sfnt_off0001fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBF8 5468 bytes
SHA-256: ebcbf83444f3708be28b98c33e357539b0fbce6dfed9fff62a706a1e376c11af
font_02_sfnt_off00020e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E8E 12144 bytes
SHA-256: a3e3bb68a143e270781b01193b2fc60e928c6e499233b8691173dc553c7ac089