Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbcf656e88ebc4…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 11:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f52f3be95ef0d9b2e0481ef68df18cf2 SHA-1: 59bf355ec8d466656a9110d99f4a7753206af494 SHA-256: b9dbcf656e88ebc4212731c0707534aa8eee9c7c55057256dd2c1340e619a231
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://jottigo.ru/123?utm_term=bloons+td+6+apk+mod+12.+0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478398/normal_600b594785ed8.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/c8f1e03.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/c043596e1e.pdfIn PDF document text
    • http://sadovik.me/is_a_low_carb_diet_as_good_as_keto1efxc.pdfIn PDF document text
    • http://geniusenglish.space/22628705997d694n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406166/normal_5ff0afe40efbf.pdfIn PDF document text
    • http://deutschebank-meine.com/73266272560qkjn9.pdfIn PDF document text
    • http://oyuncuxx.com/85605766636i0byv.pdfIn PDF document text
    • http://aycotoro5.xyz/netgear_n300_wifi_range_extender_-_essentials_edition_ex2700_reviewe2iqb.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/iHuiejc/flights_to_las_vegas_from_nyc.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/kopesenipe_wegarug_fawodem.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/Fiejjid/vuzagegokikupumululivusap.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/iatgic6/gulanodarozamadukawus.pdfIn PDF document text
    • http://it50discount.pro/60617898105hkoc6.pdfIn PDF document text
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/duwadibi_lilizunipunig.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/csylCT8/funazitobetuzejafutidov.pdfIn PDF document text
    • http://omerkatanalp.com/guide_du_routard_japon_20190kwgf.pdfIn PDF document text
    • https://regagilozot.weebly.com/uploads/1/3/1/8/131871395/kegiwagirid.pdfIn PDF document text
    • http://bionatur.space/8120833527n7gez.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/verirejon/imputed_income_irs_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/characteristic_polynomial_of_a_linear_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/accutron_service_manual_series_214.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/safojosejodon.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5636 bytes
SHA-256: cec18cfcee332a5a0db27f7da7c64855ab444cd04d58d0ceb3f9853bfed4da52
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 11172 bytes
SHA-256: 2c4e0bee9ca4caeb69831e55a0f16a590813ab98366fae37261b16c487b1424b

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