Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6626ee4d17c6dd…

MALICIOUS

PDF

69.6 KB Created: 2021-03-16 01:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457bdd3e84ff5594195dc36be9041cbf SHA-1: e448f5f4c6cf87e68f02e72abab8f266b182fac0 SHA-256: da6626ee4d17c6ddce1b09d1a1227ec018da975df74a9dedd934ff09cc736aa4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a distribution mechanism for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs like https://ponafet.ru/123?utm_term=commutative+property+worksheets further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=commutative+property+worksheets
    • http://muvezada.iblogger.org/22814584934.pdf
    • http://sandiego-podcasts.com/assistant_pro_for_android_23._33_apk_downloadawd0m.pdf
    • http://zovanatul.iblogger.org/autolink_al319_abs_codes.pdf
    • http://nofipozi.22web.org/diwijenomeduf.pdf
    • https://cdn.sqhk.co/xawodoze/ibgjaih/benobuwoxoxom.pdf
    • http://trokot-roznica.xyz/crossword_puzzle_maker_free_with_answer_keyc0gcr.pdf
    • http://lbaranaydin.com/english_to_spanish_translation_software_free_download_full_versionj6tqf.pdf
    • http://xenavowi.22web.org/nupipivugenokudi.pdf
    • https://cdn.sqhk.co/maxolavoweje/Txahaft/wefobokixudurowutowuk.pdf
    • http://nosadowatipuwaw.iblogger.org/81912397742.pdf
    • http://pasendapp.online/taxeg15hzm.pdf
    • https://cdn.sqhk.co/pugirunosamo/fdkXYij/hashtag_for_likes_and_followers_instagram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wugujub.onlinewebshop.net/palmistry_marriage_lines.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_2f3a6f9e72924244ae8a4e5102efc47f.pdf?index=true
    • http://zogosugo.onlinewebshop.net/32775671773.pdf
    • http://vozekalazasof.rf.gd/tupivufugidenaxi.pdf
    • http://bitugoxopezuwu.rf.gd/arrow_set_vector_free.pdf
    • http://fositelorefux.epizy.com/tiboruf.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_6e7f16dba3154c1e8823101785e76483.pdf?index=true
    • http://faperolakaf.rf.gd/nalupuxasigelazenob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d323.bin
ae7ad1b984f726e0004db6a69e4e02e0b98128a689ae01bfddd2f8a0a55c65c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 5248 bytes
font_01_sfnt_off0000e4e8.bin
87e09ec8e73e1cf96bf534d1b9bf1b87a95be3b608b38c7b8cef5a553ac0e861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 10556 bytes

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