Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56f72cc43cf60f2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 07:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eab2fc9821cde0cc09c02c0ef55a62c5 SHA-1: 96b91306ce7f4b067f069d3490c6e30eb2a3413d SHA-256: f56f72cc43cf60f21c96685cbc968da12ea73ee8fbf5ca833ffbb5ca58ff956d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=grounding+techniques+for+anxiety+video PDF link annotation
    • http://vereffka.xyz/750549429633w2zd.pdfIn PDF document text
    • http://frut-tree.site/zefaximisigisasuzst66d.pdfIn PDF document text
    • http://livethailand.fun/free_baby_hand_embroidery_designs_to_download0c7oy.pdfIn PDF document text
    • http://storezone.info/kukiwomatogarewajuti90cd6.pdfIn PDF document text
    • http://zathkatow.xyz/how_to_go_on_a_vegan_diet_to_lose_weight4yvp3.pdfIn PDF document text
    • http://rubka.space/behringer_ultracoustic_acx1000_acoustic_amphr5pt.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/xoxokizezikawetumabavabux.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/tamofajaxiraravorabitoned.pdfIn PDF document text
    • http://medgaj.com/oklahoma_cdl_practice_test_general_knowledgeklv8w.pdfIn PDF document text
    • http://timelessdecorum.com/361554519559dbrs.pdfIn PDF document text
    • http://carbags.site/talar5tzhp.pdfIn PDF document text
    • http://daating19.site/information_about_neet_form_2019ve1tc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_1da5c7c57e0d49dfafbc60a456f4466c.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_c534314c7a6e464885b7862db52f82dc.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/refisefapufeluwakife.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/eloge_de_l_amour_alain_badiou.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 5640 bytes
SHA-256: c6de53cb27ef9515b7a0d80a7002bb1a8097c7a744325485b9c8b1f968a9b890
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10512 bytes
SHA-256: 18293d0df9310a6b6650f4ab00d0f875edc7d7e8f031a0aa2a80673b00167934