Malicious PDF — malware analysis report

Static analysis result for SHA-256 3340958cbad31d90…

MALICIOUS

PDF

85.4 KB Created: 2021-03-07 21:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ecee71f58b60da35f4f8e3aa43d49b0a SHA-1: fd67e959135b27e1f361cb24fe7e21b2ccfea6e2 SHA-256: 3340958cbad31d90c8a97519903f6b10e099fa263df300c51d43a886f36365cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://golowaki.ru/wix?keyword=fnaf+3+unblocked+66 PDF link annotation
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/cee02af42.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/e2546c81e.pdfIn PDF document text
    • http://strapslap.online/how_long_should_a_roomba_980_battery_lastfkaos.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/2946ed4be0.pdfIn PDF document text
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/tirobomekipi_gelopubexejam.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/tuzeja_bamifelamale_fusumedekevek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff6692960f58.pdfIn PDF document text
    • http://takipleskazan.org/accg315_group_reportca33y.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/kenatukak.pdfIn PDF document text
    • http://crubr.space/50209473877fkrpc.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/3114937.pdfIn PDF document text
    • http://gatorama.space/concha_ear_deformityytgyu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ff37d3a371ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_60038ed353305.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/jogakuto_wexovugegan.pdfIn PDF document text
    • http://vefaporuzudu.iblogger.org/filmywap._in_kabir_singh_movie.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/rutufokedizon/legevik.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/ruzozan.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/8171450716.pdfIn PDF document text
    • http://woporebokut.rf.gd/big_ideas_math_geometry_oklahoma_edition_answers.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/how_do_i_fix_my_tv_remote_sensor_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/27218985139.pdfIn PDF document text
    • http://suboxasolu.rf.gd/nikon_d5200_charger_price_in_pakistan.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_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 5216 bytes
SHA-256: e3352d5c37f661fae95a436118648c5a15bd05aa2efce7687cdb51d4c1a9ef5d
font_01_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 10276 bytes
SHA-256: 447c512ef6cd9a85938c3d03ffe5141a887d1614f10b2c0e4db56c3967c52550

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