Malicious PDF — malware analysis report

Static analysis result for SHA-256 611c5b3306cf24f7…

MALICIOUS

PDF

88.6 KB Created: 2021-03-29 03:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 52e4ad06feb4260e712e6a80e5a661d1 SHA-1: 58a2e4a6f4eb791bd20bf30afa7d03e66e20d05f SHA-256: 611c5b3306cf24f7a2838524d03f968a8fb91125b68c163492be42768a8c5570
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/award?keyword=biblia+reina+valera+pdf+online PDF link annotation
    • http://odebayitrafikhizmeti.com/abc_7_los_angeles_reporterst8nqc.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwasowoset/UnLVljh/35042107728.pdfIn PDF document text
    • http://xejelofewi.mygamesonline.org/badinerie_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/ijNS3jc/zikafokozozakoviledep.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/girVv1Y/oxford_children_s_picture_dictionary.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/adobe_creator_pro_download_free.pdfIn PDF document text
    • http://tohld.in/vapirepugemajub90q3.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/dMYogcw/xuluvurazoxevelezozubot.pdfIn PDF document text
    • http://soldonlakewood.com/kidufezanusuwubogoxisi3dt9x.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/hgibZlX/sewekolopuxadajifozez.pdfIn PDF document text
    • http://basvuruizleme.online/odas_de_horacioicdxj.pdfIn PDF document text
    • http://xiguxivevov.sportsontheweb.net/the_rise_of_anthropological_theory.pdfIn PDF document text
    • http://woxagaxizi.22web.org/bethesda._net_launcher_slow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/468392551.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_91fecaf83859429988aefa2b5013488f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/76689461780.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/jobekenu.pdfIn PDF document text
    • http://mabukivo.epizy.com/74475787766.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/what_is_process_of_breathing_in_humans.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_0481ea5d7847452fafb07dac79e62c21.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 5108 bytes
SHA-256: 24879864b0c419dea35f45fd75664ae46d96462bd72d7fe5d6641627345e882d
font_01_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 11692 bytes
SHA-256: c33fb4b5874246e7ed733580cc862c932823acf1d2e8f4451057182b97fba36d

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