Malicious PDF — malware analysis report

Static analysis result for SHA-256 d519dd8488643f62…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 23:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f7eae3ed70333ef5c1427c754ca00bf SHA-1: 2d0f37c2dc0b945edf822dd33e7fe013d652fb90 SHA-256: d519dd8488643f62efaa6134723a4ddd472149bbf0597256f6bbccb48df0c075
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 0.9993

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://leonvi.ru/123?utm_term=free+grading+sheet+for+teachers PDF link annotation
    • https://cdn.sqhk.co/bipozipo/jfGHTFv/anime_wallpaper_4k_live.pdfIn PDF document text
    • http://digtalcaliper09.xyz/nonofuliloxabirnntbl.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/hJafyhd/98490583381.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/MhbAEib/california_road_trip_route_planner.pdfIn PDF document text
    • http://kersita.fun/mematikan_adblock_di_chrome_androidtzsjf.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/giibjgG/monsterland_junior_vs_senior_level_14.pdfIn PDF document text
    • http://sks-expertiza.ru/retepidulibodomolam5amml.pdfIn PDF document text
    • http://train-home.ru/vepuxemizaki83ih6.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ghfiehf/suburbia_city_building_game.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/1063116.pdfIn PDF document text
    • http://stankoff.org/how_to_enlarge_shapes_using_scale_factor8jkh8.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ihkjejj/regeponowekuf.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/iYhhtjc/83295927356.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/rgcbiie/monkey_knife_fight_states.pdfIn PDF document text
    • https://sozogamawi.weebly.com/uploads/1/3/1/6/131636736/3780964.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ggYjfS8/nexogizamiwebikebojodav.pdfIn PDF document text
    • http://masito.space/interior_design_schools_in_los_angeles_caw5d6y.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/3c929e5.pdfIn PDF document text
    • http://alkim.xyz/kimotovoxuzasuvosifusotrll.pdfIn PDF document text
    • http://tipografiyav.moscow/a_que_hora_sale_disney_plus_en_mexico78i7a.pdfIn PDF document text
    • http://pearhaidhr.fun/ornamental_plants_listiyrj1.pdfIn PDF document text
    • https://medefali.weebly.com/uploads/1/3/4/0/134012737/morenekifej_deluvopo_kamadez.pdfIn PDF document text
    • http://spiritstudio.ru/905258922432mn21.pdfIn PDF document text
    • http://aazzzry.space/xomejefiwoslov4t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5208 bytes
SHA-256: 9e9566602819c01518613c7687191e5afa2a8ce1988f7e709a9639931f919a2c
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10168 bytes
SHA-256: c14f902698aebe1e80981e2e14443feaaaf70d96a064152af225d4b6d02da8f4

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