Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c3047ca3c43418…

MALICIOUS

PDF

79.9 KB Created: 2021-01-26 13:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cbf6654d502f14cca048ad5e6d020021 SHA-1: c0c51205cb410c373d01164d7bda60c1d2b56904 SHA-256: b1c3047ca3c43418ede9bdedb7216b1a5d626fc0c9bccbe88e9c9b339a179791
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of these URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=budesonide+formoterol+inhaler PDF link annotation
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/dc5c4.pdfIn PDF document text
    • http://com-servers.online/average_cost_of_dental_implants_in_floridalxq9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_5fdbd1fd71d40.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/fijigesidezosixijero.pdfIn PDF document text
    • http://yourlivehelp.com/emulator_win_10rjldb.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/sivivavadoxoje_ridonelugil.pdfIn PDF document text
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/kuzexe.pdfIn PDF document text
    • http://famesodelazij.22web.org/rorixixamupejepo.pdfIn PDF document text
    • http://goshop32.site/418829456598wl4p.pdfIn PDF document text
    • http://khareedforosh.com/sdg_goals_5iv3h9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fda6260c2dd2.pdfIn PDF document text
    • http://edayafar.xyz/uppercrust_motherwell_pricesfkh26.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/daliki_dogovarototani_sanadepofirawuv_xodazev.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/we_communications_bellevuecev1r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fec0a46cf4b2.pdfIn PDF document text
    • http://reduslim-europa.site/car_crash_maximum_destruction_mod_apkwmf4w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fdc791a90cb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabozet.epizy.com/72203911100.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/82567608229.pdfIn PDF document text
    • http://sejojoxo.epizy.com/lithops_aucampiae_kuruman_form.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://scripts.sil.org/OFLIn 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 5196 bytes
SHA-256: 289621637876702fb845a5dadfb8a3a6faefd39057a7ff6046b530b85fe8a201
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10076 bytes
SHA-256: 8803b9a27860a770abc11df7b7463ea50572d0ef64a372d8f6ed9afa476c1b0c
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8