Malicious PDF — malware analysis report

Static analysis result for SHA-256 1690ace68487f1eb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 22:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 187b3c153a5e39ea03a8cdb68515c1f1 SHA-1: 288074832b25d43708d009a508154cee7f079af1 SHA-256: 1690ace68487f1eb94dbb29e15917eae22711c3148011d76f8cd7e1eb45dce37
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external links, many of which point to disposable hosting or domains associated with SEO manipulation. The primary URL, 'https://botokaw.ru/strik?utm_term=strange+days+on+planet+earth+invaders+quizlet', suggests a lure related to a quiz or popular topic to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=strange+days+on+planet+earth+invaders+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5fe8540037b5c.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/RSBo2c0/rankin_bass_productions_movies.pdfIn PDF document text
    • https://dirovobu.weebly.com/uploads/1/3/5/3/135319654/wesovut.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/CjeFrjh/best_size_subway_tile_for_kitchen_backsplash.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5fef6142703b0.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/icIgh7p/avg_antivirus_pro_mod_apk.pdfIn PDF document text
    • https://finepeva.weebly.com/uploads/1/3/5/3/135347337/kixizotuzopam.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/hdjhPjf/rebuilding_credit_loans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fc71cc340f22.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/Rgj2Fgf/nitobusepujew.pdfIn PDF document text
    • https://tebokefabizanil.weebly.com/uploads/1/3/4/8/134866802/gewemudalu_gitavalobojumaw_vifada_buzazodojob.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/xuzunexudet.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/PERheid/switch_games_top_list.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/ralojisime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/welanisowari/animales_nocturnos_informacion_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/zepakusorexovegiv.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/descendants_2_hd_movie.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_2d558260d5ed4f9cbe3cf5506e7b795d.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_1aef2b80d58e45f286341edb4af953a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/broadcast_domain_and_collision_domain.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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 5664 bytes
SHA-256: 7103f077b47627da6cd6a06c996e3c5321e408defff6c0b7ea29141dce3f44b4
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10740 bytes
SHA-256: c32ab91bbde9c4f74dce99a9981093a7b6af98ebcd41036fe49bbc35ffebbfa9
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15