Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95acb114201095b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-20 03:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4219f91c4fcbc21af59c7e3f5ba7e8dd SHA-1: 2c75b3fb54373f8b2c1b5838af44b44f4bd42a30 SHA-256: f95acb114201095b4495ec3d908b03def07b224d24f1ca87fc64e501a244c19e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary lure being 'sermons outlines notes pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to malicious sites.

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 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://fokemale.ru/strik?utm_term=sermons+outlines+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fc6acf2b2fb8.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/FhMijP8/inventory_control_sheet._xls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_5fe3faf664c71.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/pObidIM/rabigotijebajazeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fe17ab088994.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/fZjch2h/89807988186.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/gdjfidK/bitcoin_wallet_address_format.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/7GgiUhf/nursing_intervention_of_anorectal_malformation.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/Ejhegfs/my_bt_login_not_working.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/wigefasaxufadag_juvibupedemitem.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/hjFFgjj/32572592248.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/dozaxuforem.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/4798843.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/xwShbHJ/wotaz.pdfIn PDF document text
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/suxataloletovojov.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/nogirabunar.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/teximikamukubo/89992381994.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/comment_afficher_les_formules_sur_excel_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/fudima.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/getuwuzaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/pinupabumixedalepirez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd9c991-1b1d-481c-8a52-38f9435ed8ca/clasificacion_de_las_cuentas_por_pagar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cdbd10-a901-430d-9b2c-771d5f9caabc/65195935197.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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 5080 bytes
SHA-256: 9ad7d7233b3325b73ef1e937062f36d2c2aae5ffb62337e7ab3bb134fdc2ba45
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11192 bytes
SHA-256: e3718119328ccd98a65a5b63345337e62e9e5e7cb1bb5bb2b4edf8281e7b162e