Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a10fcf8afe5751…

MALICIOUS

PDF

76.6 KB Created: 2021-03-04 08:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 186e23b3522b80200005b5d20c37d72e SHA-1: b9561c9d402dbd5a6469e17238b2d5d199c448a6 SHA-256: 55a10fcf8afe57514b33eab4c6dc613e57c424a4d2c8c1e709dd7bff633f2e87
126 Risk Score

Malware Insights

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

The PDF document, disguised as a guide for making paper airplanes, contains numerous embedded links to disposable domains. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution campaign. The document body itself is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=how+to+make+a+paper+airplane+fly+far+and+straight PDF link annotation
    • http://lazujifoxupa.getenjoyment.net/graco_solano_crib_manual.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/luned.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/15277211172.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/vorelulatipazalupe.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/autocad_training_report_download.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/66213447010.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/fanagateguvoterudimozuvaj.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/29819783566.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/71702980081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/vilujomoxewodimifoban.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/mot_udarowy_bosch_pbh_2100_re_550_w.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/57615331642.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/vokazusosase.pdfIn PDF document text
    • http://jokosen.atwebpages.com/hp_laserjet_4015n_printer.pdfIn PDF document text
    • http://mogexusa.rf.gd/jingle_bells_musical_form.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/alsip_weather_report.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/88687734815.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/derusunosoxebirulipalu.pdfIn PDF document text
    • http://vakusidoler.epizy.com/tilikizanotipewozinolavo.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_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 5672 bytes
SHA-256: facd59e38337b10353062d13b8f6f64b9dd391c081cc47d71ee58b5e283ad5d8
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 10112 bytes
SHA-256: b764366e0b9386bfd88cd13eee63a82d95c106e016f1fb4fd8b203f29e5c377a

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