Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d13769b917b9bb…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 20:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8a7dbddf4772d71b38efe7e371eff9f4 SHA-1: 5e525f63aee3c5da73e6c4d36aa5084e8e0c67d4 SHA-256: 99d13769b917b9bb1bcd76ebdced9f7c31aed834dc598cab9da2005ec16db5ad
182 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to a book summary, likely serving as a lure to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8609

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/award?keyword=men+without+women+summary In PDF document text
    • https://donigulajerilag.weebly.com/uploads/1/3/0/8/130874297/517863.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/cjcQk8k/v_moda_crossfade_m100_master.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/d20_call_of_cthulhu.pdfIn PDF document text
    • http://fidisop.22web.org/50888603343.pdfIn PDF document text
    • https://cdn.sqhk.co/fololekumi/ggi8ib3/piano_band_dj_download.pdfIn PDF document text
    • http://legendarycraft.ru/the_deep_peter_benchleyblewt.pdfIn PDF document text
    • https://sogutujugaj.weebly.com/uploads/1/3/4/4/134403955/gedekadifibefetul.pdfIn PDF document text
    • http://tokio-2020.fun/53943597364daq2d.pdfIn PDF document text
    • http://online-bestshop.xyz/monster_races_5e7j74m.pdfIn PDF document text
    • http://connexion-amelii.xyz/enthalpy_of_reaction_problems_with_answerss4i8b.pdfIn PDF document text
    • https://pusakinadolelu.weebly.com/uploads/1/3/2/6/132682110/jitaxi-terukamuva-newapi-botamisabanir.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/oibYSia/airport_city_codes_ios.pdfIn PDF document text
    • http://timecodes.net/48253589333mf0g2.pdfIn PDF document text
    • http://dvigatel.guru/96415502279y8rnf.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/17733412942.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/1867162.pdfIn PDF document text
    • http://zinuxuf.22web.org/cheat_capsa_susun_topfun_game_mod_apk.pdfIn PDF document text
    • http://mmmmmme.space/685593512780rl5.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/vjfoibk/dictionary_english_to_farsi_free_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://nelosizodi.rf.gd/98276945065.pdfIn PDF document text
    • http://nulukuduvi.rf.gd/balo_da_informatica_sumare.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5588 bytes
SHA-256: c5c41b21a7aafde7b27be626e0b728f87188f17961ccb7c28355bd63c29eb0ca
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 5092 bytes
SHA-256: 5f3928e655f8c8b8a923ad4c3da828f0c82a7774f75d113e3b04c958d157015d
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed

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