Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2a38991b1187d4…

MALICIOUS

PDF

70.1 KB Created: 2021-01-22 18:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 938a98ddfb9f8fa5032a03e99e180fac SHA-1: 9ef4352ed665b652e129e02ec55aa3a05ad52c08 SHA-256: bc2a38991b1187d4b8d199c1749ab97242b47024e0402094eaea3c6551a5971b
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to redirect users. One critical heuristic identified links to known malicious redirector infrastructure at 'https://traffmen.ru/123?utm_term=area+code+503+location'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/123?utm_term=area+code+503+location In PDF document text
    • https://site-1176106.mozfiles.com/files/1176106/vexojezanixivujafovoxuta.pdfIn PDF document text
    • https://site-1168046.mozfiles.com/files/1168046/infinity_pool_singapore_pictures.pdfIn PDF document text
    • https://site-1175574.mozfiles.com/files/1175574/throne_of_glass_characters_fanart.pdfIn PDF document text
    • https://site-1177680.mozfiles.com/files/1177680/ralobobejisabimevuza.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/nimelojaf-vumimetide-godixuvezum-vowefetamub.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/6af266265a6cb98.pdfIn PDF document text
    • https://site-1166625.mozfiles.com/files/1166625/83425740716.pdfIn PDF document text
    • https://site-1228403.mozfiles.com/files/1228403/astrology_answers_weekly_scorpio.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/4066772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joratunezawaxa.epizy.com/agriculture_notes_for_upsc_prelims.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/calendar_2018_week_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/negugawe.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/vcf_cutter_free.pdfIn PDF document text
    • http://fikuputo.epizy.com/beach_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/35325017638.pdfIn PDF document text
    • http://relumewamamit.rf.gd/2d_shape_worksheets_for_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/telas.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/wubiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/concepto_de_amparo_directo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/nadhom_asmaul_husna_arab_dan_latin.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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 5176 bytes
SHA-256: 4e205210361854b23b04dce124bea297edaba0469f4c3cc4c27acc93abe766ad
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 10512 bytes
SHA-256: 0b74e598e0aa7cc46b3d3d4b9febf7681351382a147c453a733a3614922fcfd7