Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf78de74b21f00d…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 03:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdb120fa589e80207bc25fddb082d72e SHA-1: bdffa6f1dbf3b5935d840eb19ee1592b7a5dc2c1 SHA-256: adf78de74b21f00d38c004495e900508a9f5e9ada12c5f2b014918f8e0035df6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common image-only lure, presenting a screenshot to entice user interaction, which is a typical phishing or malware delivery tactic. The presence of numerous external URIs, many pointing to disposable hosting, further supports this. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely leading to a secondary payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 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 http://smalternatywa.pl/media/upload/files/c3a0bc8f45943248148c17ea626390a9.pdf In PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/65543382097.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/45045229472.pdfIn PDF document text
    • http://m2m2design.com/userfiles/danegumiwilasujugexixubom.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1a83f7513766969a381e2f5377c4c4c4/mevukokokaturore.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nolomifisapatis.pdfIn PDF document text
    • http://terrietanaka.com/library/files/37208385593.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/56553038730.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce4cf0fde5---90499590941.pdfIn PDF document text
    • https://service-panev.com/userfiles/wisesoxuwakekid.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/wadokufovexogevijawutaf.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/14/xifixofijojinemezuwutilog.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30171956394.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/bimirude.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/84856891090.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zaxamosof.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/49483970874.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/65212286116.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/mutopefafunozakosira.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/lidogotazo.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/puderower.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/88928556881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dead+trigger+2+god+mod+apkPDF link annotation
    • 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_off0000ac13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 14468 bytes
SHA-256: ae7d4ae3532ffb75506441c63c5cbad88ad70006454f66aff964b1b5d5eae3dc
font_02_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10628 bytes
SHA-256: 209070aaa438ebfb30d189fb622cdcbb78cd3c4a2d5e1bd69237ecf8eff2fce9