Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a856b82e597e4ad…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89612a0e45024d62dd12f822eca9aa5d SHA-1: b16cf5024d57c5eceab886061091b3bde21d4c04 SHA-256: 9a856b82e597e4ad367582b9adf186fdf160fcd7c2a324e4d646775892e9e11c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. The numerous external URLs suggest a link farm designed to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=flash+player+apk PDF link annotation
    • https://pokereshop.cz/data/file/99864032275.pdfIn PDF document text
    • http://ccsl.asia/files/rimawijoroselujusakipu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/lulavelararudadanato.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902104943823875.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tidaxikujisuzitaripani.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1a1a33b75dbd8143b5932d3b48f1e3db/mufebavujuposusepogije.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411ba9ce3a9---7487056866.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/26393332385.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jisebuxegajuvotowemota.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903111028031.pdfIn PDF document text
    • http://analhospital.net/file/files/19562698500.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/ketabazoxiti.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/45309625317.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/95182627409.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/60806784319.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/13786499050.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/43676805620.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/lemegiwupe.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/womelavewovikinubotu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/76560736693.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55910985853.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gumiwo.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/18127387472.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://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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 14196 bytes
SHA-256: 19d24f37abd5d83cc661b18c87b6ba3fb5a217c7463f508d5817ab32f7263116
font_01_sfnt_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 10120 bytes
SHA-256: ef1381c6efcd534ce646d032c07b0c551810d9bdef0b4c5042f7cfbfe82dc542
font_02_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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