Malicious PDF — malware analysis report

Static analysis result for SHA-256 3230c40eae788346…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 07:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71b1f99d66ce14fb575979a5f641f78f SHA-1: 001fe8b33eef65d859e2443a15b7f89ccd615f29 SHA-256: 3230c40eae78834602c849ca36232d3aff271503221ab18763b78f45f39b4b7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=fortnite+ikonik+account+free PDF link annotation
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70119283961.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/76312688008.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gilibinikur.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/26861877154.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///24349990698.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/relageluz.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/75886151441.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/1623173264.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/safikiwizi.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/ziwap.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/21989175675.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vibepagilurajada.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/limukitikagagu.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/60048184106.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/gujururujogebaketukovid.pdfIn PDF document text
    • http://lulanjina.net/upload/files/xavisobusizuxobuxamivitub.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145644d55eae---98747737270.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/34380886232.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/55014703272.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903075055.pdfIn PDF document text
    • https://satesayap.com/contents/files/pofixomazojinixaboj.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/42424240451.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/xikagobibotinid.pdfIn PDF document text
    • https://lesura.net/userfiles/file/54537901568.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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 14316 bytes
SHA-256: a0ecb2a996e260719f070d07c787f4f8114b0d045023516cba46330179dee521
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10284 bytes
SHA-256: cd5e2323daed37c3f10a96fa6772dda89d4d1583e3c908649119fc86f296ea3b
font_02_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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