Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ece1548911046…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 22:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee1021359fb2740140cd13c4c8a4ddea SHA-1: f6e00960c299d869e3856d369d051d673bf8b30b SHA-256: 826ece15489110465e09d4da074d8ab932fc46a0e2ab87d7becc8ad1581947cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a phishing or scamming operation. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=download+apk+live+football+tv+streaming+hd PDF link annotation
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/43288670415.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/59585272420.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/23724170012.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zonunifofajebakudik.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68260218688.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/78739839374.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c89c953af86c55a40f6b23a3816b2171/60988857511.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/58567447500.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/koruronot.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910085700.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/biludofexapabusuja.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nerigiwukudan.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/nizuwalosiwuwatiwowubo.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/10832536892.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/41393472454.pdfIn PDF document text
    • http://haki.vn/uploads/files/88199152015.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/numer.pdfIn PDF document text
    • http://novichiha.ru/pic/file/59159014885.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/76621983301.pdfIn PDF document text
    • http://farashimirooz.com/files/fexibikifetanud.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/39458143082.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/36118883776.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/nibekevowegevusezopolutuf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2a7190f0---36298233429.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vekomudojekon.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 17548 bytes
SHA-256: cbca630c320955de5e05cb764e6b128bc5dd6ae000761098d01aa8edd1aa82b3
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 11332 bytes
SHA-256: 82cae93360ba30f2abab0b4baafba72a7cd9e1d3ed7d959ec5cfed092f8e278f
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1