Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bacdcc057d57b3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 07:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a4a49caab527aae1e6e16fb890c41cb0 SHA-1: e6fe3c5cc774bc1c80d1389bf4e5de3dfa18387a SHA-256: c1bacdcc057d57b3185ecb622a7468e7ab7d72f440c0daf88138df0966d96b4e
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=read+body+language+for+love+signals PDF link annotation
    • http://kleomaften.online/jekunubijisuj3f5sg.pdfIn PDF document text
    • http://cmb-societe.com/how_to_use_bns_buddyseihe.pdfIn PDF document text
    • http://gufutaca3.xyz/divergent_full_movie_in_hindi_free_download_hdzywa0.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/AjciawD/64669982969.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/organismos_bursatiles_en_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/bafngiT/idle_shopping_mall_max_level.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/kjggegh/basic_english_words_for_grade_2.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/free_fillable_household_budget_worksheet.pdfIn PDF document text
    • http://daating19.site/are_dymo_labels_recyclablee8kos.pdfIn PDF document text
    • https://cdn.sqhk.co/tugadeboda/0SIMggl/cyberfoot_2019_apk_hile.pdfIn PDF document text
    • https://cdn.sqhk.co/goloravevi/cjj2qia/zuketigapevexaf.pdfIn PDF document text
    • http://ideaita.fun/matheson_hammock_park_beach_miami_floridarundh.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/zugogunofed.pdfIn PDF document text
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/ba8b88.pdfIn PDF document text
    • http://presentinsta.site/samsung_un32eh4003_smart_tv3iwa5.pdfIn PDF document text
    • http://7lessons.website/99907542205rifch.pdfIn PDF document text
    • https://pewepexit.weebly.com/uploads/1/3/4/6/134659954/230775.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/CUjbiaa/20745329034.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/eHhdRjb/98080376142.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/warufada_ziboteje_posijos.pdfIn PDF document text
    • http://bottlechainworld.com/rekazuwid58tuh.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/wuxodotiwodef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/73616813797.pdfIn PDF document text
    • http://dugerem.atwebpages.com/agriculture_business_management.pdfIn PDF document text
    • http://kopolug.myartsonline.com/77468092108.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5384 bytes
SHA-256: 4b747f7e98b5b40fd8067123fbb479fd6c2b07c198f368aab51485e90058d394
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10532 bytes
SHA-256: 8bcdd14e978c5ed4d5e7696130aff918620ed6c0ed3238ea4fbd4a0f3afc15e4

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