Malicious PDF — malware analysis report

Static analysis result for SHA-256 686b28cb0c4ceefa…

MALICIOUS

PDF

108.4 KB Created: 2021-04-20 08:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 01df34fee7638e9a76111b1919a01712 SHA-1: 5b404f4877513682ed90f51e3ac0b4d1973ec374 SHA-256: 686b28cb0c4ceefab3a22552bfb3d222199ef4b65ce76d6251a309365102d934
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 0.9998

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://soxebez.ru/strik?utm_term=the+rapid+fat+loss+handbook+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bojojiweg/bicvVgj/2020_college_football_schedule_acc.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/n5iaegg/descargar_fling_fighters.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/uidjjhe/15554523475.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/324267.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/jdZnhig/swing_shift_movie_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/jcpXRih/prison_break_season_5_episode_9_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/1jifWQZ/dj_marshmello_friends_song_download.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/0z6jfDq/50602441455.pdfIn PDF document text
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/3818603.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/8689661.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/jtgctBS/ulala_idle_adventure_change_class.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/fACgjeu/neko_atsume_kitty_collector_online_hack_generator.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/5973125.pdfIn PDF document text
    • https://tozupolut.weebly.com/uploads/1/3/0/9/130969077/0b42308982c05b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_f674c7b289aa408890168fe087a863d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d403bd6e-3b6d-4580-8292-678e87d18a2a/jelatelubilab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b5b3bc-507e-4626-acc6-76154693d1b1/67845982230.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_d7627e0dfcc54474953e694a434eb9c7.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_a29bc60596b941f8aff7024d2d99e70f.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001602d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602D 5372 bytes
SHA-256: 715d793de20edee5ababf8833752c8a2fc7ce7c01e7c8a4f1b405e413200d702
font_01_sfnt_off00017270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17270 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00017afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFE 11348 bytes
SHA-256: 503b8aa43ce6c497aea22c12b82f250d73fac858353eb269218072d1cf1163df

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