Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a2fd7f0013c5ed…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 01:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8458c7e096c32a3dffe6e49f4f3e9b13 SHA-1: 68fe4b81298c408b6aa8e5cea4fb73a323aa846e SHA-256: 62a2fd7f0013c5ed5e28c3cfc1c32c7d7852f5088f0083cc670b486cb7273a82
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zae.me/datafiles/file/nimilokinuriv.pdf In PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/94227950564.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/xemugato.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903132500782264.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/28175512155.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/61625238832.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/20542810525.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/30013229554.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zusimamaw.pdfIn PDF document text
    • http://belloverde.net/emailer/file/34523066947.pdfIn PDF document text
    • http://talesma.com/E/file/31992711523.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/21391450941.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/35407612019.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/fopeti.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xoxakixitudosuv.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/tizozogexodokopubokagesof.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/2937606834.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/65571816585.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/poderedawakojukiveduxa.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/81652170627.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210908_5E9E1934298BF67E.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4254828f---80623289886.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ffc7d7234ea8f3063ba9df5449c2e76d/rovanize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=telegram+channel+apk+downloadPDF 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10744 bytes
SHA-256: 61a4e6204c0b669a744e3359a8939159848825a7ea30295c01c4bf28614acfdd
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 17996 bytes
SHA-256: 5f17dcaded009c3014463be6571dd5602f6731ad5ba3e93e8a699c5795ecfec0