Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ef4ea2770b98e…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 14:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a688c23b2a055b1420b430bd8db1cff4 SHA-1: d349acf08c53d56ff4714eda3b6418d52cc5d787 SHA-256: ff3ef4ea2770b98e14eb83619e74f7aa2ab2c045b69555dcae53b46b7c0e3516
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to a redirector URL that appears to be part of an SEO link farm. The primary redirector URL is 'https://seumenha.ru/strik?utm_term=dell+precision+m6700+charger', which is likely used to manipulate search engine rankings or phish for information. The presence of a large number of external links and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://seumenha.ru/strik?utm_term=dell+precision+m6700+charger PDF link annotation
    • https://zirotowaze.weebly.com/uploads/1/3/1/0/131070424/229233.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/32555219294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6055c05ea7ef3.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/all_blues_chords.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/womifux-gojuwafe-fezoposare-fufonikatod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60272f033b840.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/ejercicios_pronombres_y_adjetivos_posesivos_en_ingles.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/wosatenezagegug_bevojabebo.pdfIn PDF document text
    • https://wilosobofixi.weebly.com/uploads/1/3/4/8/134858013/ruvusalo_biwunifatilogew_pepol_metazuvivu.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/7cc90e49b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff14636e087f.pdfIn PDF document text
    • https://fimusaruto.weebly.com/uploads/1/3/4/4/134472122/6358503.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/mulimufudepezevoka.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/pubopelej/free_croquis_templates_fashion.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/phonemic_awareness_activities_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/71457145501.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/baxepixetexifupapaw.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/45036145821.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/tiridukidujik.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/eddie_bauer_infant_car_seat_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/universal_audio_plugins.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 2900 bytes
SHA-256: 7b4a49995b7dd69d4afe5ee3eee77951727d25d484e62cc4016f8f5b91e0b297
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 5724 bytes
SHA-256: c4e7fa631d0b5696896a4ece5af3feb08bc262c983845796eba9cb3ef3454c04
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10640 bytes
SHA-256: bbcb2ce455bc3f4d0bd93f0919b57541f0491567bb8d3011df161f5ec571a52e