Malicious PDF — malware analysis report

Static analysis result for SHA-256 304a7b20b7d543b3…

MALICIOUS

PDF

75.3 KB Created: 2021-04-03 14:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f03650ab14af90a1e946b2a1afa155c4 SHA-1: 8141cf2acf95c2df2ebec86e96a878a547e11fdb SHA-256: 304a7b20b7d543b30cd2b7d47fe9eba4f7d15a1f5a1fe50b5eece56a5529e0ce
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a link farm on potentially untrusted hosting, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=informed+consent+form+template+australia
    • https://cdn-cms.f-static.net/uploads/4409819/normal_60140587e42aa.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_60570688221f1.pdf
    • https://zalirojojates.weebly.com/uploads/1/3/4/6/134606979/52a93eaf1.pdf
    • http://gbo.guru/alcatel_2019g_g_mobile_phone_user_manualta3r3.pdf
    • http://nubilofanekib.mygamesonline.org/rojeb.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/fajama.pdf
    • https://cdn-cms.f-static.net/uploads/4445743/normal_60519066cda8b.pdf
    • http://dapajurop.mygamesonline.org/conte_bilingue_arabe_franais.pdf
    • http://internet-babki.ru/the_lord_of_the_rings_the_fellowship_of_the_ring_book_summary2s6wz.pdf
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/widap-sarezizazenon.pdf
    • http://converstarget.ru/song_lyrics_video_maker_apkcrqbf.pdf
    • https://veriraxitinori.weebly.com/uploads/1/3/5/3/135394444/0e60255c0f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_be605e3fc86b4dd38955e994bcd46f73.pdf?index=true
    • http://wonanikapudidak.atwebpages.com/29155894248.pdf
    • http://vugugemo.atwebpages.com/38131894621.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/what_does_all_over_but_the_shouting_mean.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_387d5d67b4984c9787190beb875cd80b.pdf?index=true
    • https://s3.amazonaws.com/dikobepibelun/interview_format_paper_example.pdf
    • http://vekisofekibote.myartsonline.com/pivosobavoz.pdf
    • https://s3.amazonaws.com/jubiferekaka/lonely_planet_guides_2020.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_15b6313b25f54d9a85c6ed8ba5ee0bd7.pdf?index=true
    • 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_off0000eb65.bin
c9a0a737c2cff249f3acf16caa9b2f73f907b0d3aa334da8bdbab2f56c6d8636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 5236 bytes
font_01_sfnt_off0000fd21.bin
8ae9f8614ec02cc908cba192a08843bf0f5eabd450468d198a534bf6575fad0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10160 bytes

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