Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef68230fb2db88e…

MALICIOUS

PDF

75.4 KB Created: 2021-04-20 19:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a1131479ad19b2083de23c9862bd8a6 SHA-1: 1fc0abee620d67377666af4fb72eca0d6278652d SHA-256: 9ef68230fb2db88e358aa458130cfff3c28ce9c12ab579be26c0beb91e9014ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or redirection attempt. The document body, though partially corrupted, includes a title related to relationships, which is a common lure in phishing campaigns. No scripts were extracted, but the presence of multiple external links and the high confidence threat detection indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=como+saber+que+est%25C3%25A1+na+hora+de+terminar+um+relacionamento PDF link annotation
    • http://good-production11.site/418332129151aeb7.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/7020699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_603125bc73a12.pdfIn PDF document text
    • https://jumugegapu.weebly.com/uploads/1/3/0/8/130814907/difiwomanomo-satixu-pegosejagafi.pdfIn PDF document text
    • https://cdn.sqhk.co/bugokasite/cgcHhcC/82951013525.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/hchagif/44956690822.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/pivogumivasozujobot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_60067f3f19ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600a1389eceed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_606228a06fd5d.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/40596284893wxocu.pdfIn PDF document text
    • http://ryursew.space/458400676ewvpo.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/dZijgja/dungeon_nightmares_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6057b976c4c2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xejidomu.rf.gd/55368248249.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/how_to_score_reading_and_writing_sat.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/balkar_sidhu_phulkari_song.pdfIn PDF document text
    • http://topeleseluvon.rf.gd/eenadu_news_paper_today_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/palanupagalimigizeze.pdfIn PDF document text
    • http://lojogonofar.rf.gd/33654225665.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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 5584 bytes
SHA-256: 7fe08eb5e2b19533bcb52bb813db2881099417a7bdc572a5829d983f732e5766
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 12680 bytes
SHA-256: 7a025d550a2d6733480c1303109a2f88f17553e6f95b58ef575d4d68b5740c5d

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