Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7946582440abc83…

MALICIOUS

PDF

98.3 KB Created: 2021-03-21 10:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9aeb673f7dcab7fcabfc60fd610d00a2 SHA-1: df90e6cc54245e15d914e94d7a04c25589f0fa9d SHA-256: f7946582440abc83d750302b1284cb121ba3153af021c88ad9a4ab36e5c6952c
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a payment redirection lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external URLs, many hosted on disposable domains, further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://bologen.ru/wix?keyword=chaos+pierre+guide+maplestory+m PDF link annotation
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/zofopabuxagow.pdfIn PDF document text
    • https://xebuvimujutil.weebly.com/uploads/1/3/6/0/136050287/4690732.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/2003_dt466_valve_adjustment.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/brother_hl-2280dw_scan_unable_af.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/legeboweforav.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/vonisodekasu.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/pefege.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/probability_and_statistical_inference_9th_edition_download.pdfIn PDF document text
    • http://zewidixoxub.iblogger.org/63201204260.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/607104899.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/5209947.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/paxivigi.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/10190009642.pdfIn PDF document text
    • https://niravewowinud.weebly.com/uploads/1/3/5/3/135343761/kevasir_bedopojujizamun.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/bogajuloliveta.pdfIn PDF document text
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/zogofosezuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifazurufinu.epizy.com/pixodudiwunuxigurefamume.pdfIn PDF document text
    • http://jonegukum.epizy.com/davv_cet_exam_form_2019_last_date.pdfIn PDF document text
    • http://nifopufu.epizy.com/log_antilog_calculator_apk.pdfIn PDF document text
    • http://kebanibaru.epizy.com/94167496023.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/90_gramos_a_mililitros.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 5380 bytes
SHA-256: c37eaa7a9ed8662e807ba67f34f761b79c21a11694045c674ca3e41c4b6cc36a
font_01_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 11460 bytes
SHA-256: 04f3d461405ccbcba8ecc1187910ce4b9720e150b4186a95b5525c66ce1576f0
font_02_sfnt_off000166f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F4 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc