Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa93527e1b57a2f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c388114fb945a095558824a31abe6203 SHA-1: b0c00ef98b98bc9c4e87c0620a9a25bbc30d82e0 SHA-256: fa93527e1b57a2f2dcd8ae639977ae7e1857f23955e8dec0eb4ab091104f1087
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=insta+auto+liker+and+followers+apk', suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm structure on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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://pixomot.ru/uplcv?utm_term=insta+auto+liker+and+followers+apk PDF link annotation
    • http://wahluenfty.com/userfiles/lenuronosurokizivunabava.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/19004171984.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dejotatipuzogobubowulimi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dupomanu.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lifiro.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/sodik.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xuzazo.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/22356927654.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/rufowiwojon.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/woduk.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/71380186227.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wojexi.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/zujukanigekizebumokupi.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gipefid.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b6bc506---48246554914.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/53190352067.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32903823218.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/gifogiximemukelir.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pobewog.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/34156959954.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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10720 bytes
SHA-256: 8ba8126a20d3e57d21c4b3035ec4cd1ef7a75d0f5e35dd9ac953b545f454d54e
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16660 bytes
SHA-256: 3137e5899c65eaf83e542c8ff3aab4b06184f07a3493c677eee43b28397933e1

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