Malicious PDF — malware analysis report

Static analysis result for SHA-256 0677edef69be3864…

MALICIOUS

PDF

64.0 KB Created: 2021-02-21 23:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c427f9546e9c318dc6fb93e89c771974 SHA-1: e5b7c8768053168d8fe1c4e36f71f55cfcd26669 SHA-256: 0677edef69be38641e4b0a74e271eeff3dffad26b9e4a2e2766d954b4d4e45f2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains suspicious and invisible links to external domains, including one that appears to be a link farm. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of URLs suggests an attempt to redirect the user to a malicious site for further compromise.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=scott+pilgrim+comic+read+free PDF link annotation
    • https://cdn.sqhk.co/besiwowegin/wxhcMib/all_about_history_book_of_ancient_egypt.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/lHCigMx/lilelusogalag.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/7hcgjhj/free_nba_live_stream_app_for_iphone.pdfIn PDF document text
    • http://frukt.space/spiderman_cartoon_coloring_sheets7p4zj.pdfIn PDF document text
    • http://managerprogram.live/debebelanmelcw.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/jgjbjdE/simple_social_tools_free.pdfIn PDF document text
    • http://supfitket.buzz/hexagon_fall_guys_game3kkhw.pdfIn PDF document text
    • http://kihepc.xyz/virtual_dj_mixing_software_for_pc3yzgc.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/ieVNifi/madness_combat_wiki_retainer.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/hE2Q9ii/purabibakipom.pdfIn PDF document text
    • http://koprovk.xyz/664800392763set0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixolasafu.epizy.com/datasheet_cisco_firepower_2120.pdfIn PDF document text
    • http://dizojid.rf.gd/navifawezipibuf.pdfIn PDF document text
    • http://redexini.epizy.com/jenesutijatofozakokazekuf.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/applied_houdini_rigids_v_free.pdfIn PDF document text
    • http://begupegag.epizy.com/bts_love_yourself_highlight_reel_piano_sheet.pdfIn PDF document text
    • http://nomekerileme.epizy.com/evil_morty_theme_sheet_music.pdfIn PDF document text
    • http://zujoragog.epizy.com/55500417321.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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 5400 bytes
SHA-256: 69de98fc0a51043a56b97f7da90041617f1ce4fc92aabae3e7f92fa8209644a2
font_01_sfnt_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 9852 bytes
SHA-256: be7a3a1281bddac046843f71cd7a7834d4565ce47c0049ca4da240f5a97492e0

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