Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfd44ac7be0f6c6…

MALICIOUS

PDF

74.8 KB Created: 2021-02-16 05:37:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0cd8f18158f8dc74b1b1f94b0d4fd1d4 SHA-1: 41adb6f16962b030c2e7570e69090d2f5871d0be SHA-256: dcfd44ac7be0f6c6e6db96dd4feac03754670ac187eeb36a38a50ca534d7dd00
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 0.9997

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://jottigo.ru/wix?keyword=boston+celtics+trivia+questions+and+answers PDF link annotation
    • http://testersairf.xyz/capilano_suspension_bridge_park_map53x2o.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/be11ff4272f5.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/2c6eaf45283.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/bahubali_hd_songs_tamil_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/gjeifif/worajexolexe.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/hiaCO43/toriwurewigozogakekijix.pdfIn PDF document text
    • http://premiumpornclips.com/jakarevifedabefebuejbtf.pdfIn PDF document text
    • https://vosaxivuminol.weebly.com/uploads/1/3/4/3/134387598/lateseletizafagakiwu.pdfIn PDF document text
    • http://zekoselu.22web.org/fdcpa_compliance_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/ggKhaid/77941654179.pdfIn PDF document text
    • http://bluhgang.best/hallelujah_easy_piano_sheet_music_fr0npqh.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ogdzq7C/pokemon_heart_gold_e_soulsilver_pokedex.pdfIn PDF document text
    • http://slmit.space/continuity_and_differentiability_homework_answers7jmgr.pdfIn PDF document text
    • http://6gusevshop.space/atira_low_cost_housing_ahmedabad4z8qg.pdfIn PDF document text
    • http://womans30planet.com/suvevajlbls.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/hh3qia5/susopilujutitewebirixe.pdfIn PDF document text
    • http://onlyforyou.space/louisiana_state_police_troop_e_accident_reportsf1q1o.pdfIn PDF document text
    • http://nickned.me/liwufidodpds6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwukimip.epizy.com/fieldrunners_2_tower_guide.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/herbalism_leveling_guide_wotlk.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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 5260 bytes
SHA-256: d49f5b10125d8c5c0c52d32cac7facbf9ec5174d1b295a5aa9ba9ee9fd9950b9
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10396 bytes
SHA-256: 63819022c4c4023f8addf647285edc45461f02c22faf25ab08a6364cbc4d3ef4

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