Malicious PDF — malware analysis report

Static analysis result for SHA-256 66496d936d1cc4f8…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 11:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: acb784838e943e54a7fedba816732112 SHA-1: 6bba4f58dd1594274efe5ee6892c1c260a38b141 SHA-256: 66496d936d1cc4f85f81a07f14c25ebdbafc9ac45712a07f51ff2d1e817fbde9
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'Julius Caesar' and 'sparknotes', likely a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=julius+caesar+act+3+scene+3+summary+sparknotes PDF link annotation
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/55b45.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/tapemaru-lerafixepig-bopepugut-bivediwupawopu.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/bb4218d761ef927.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/lovagakarotabivija.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/e47b4d88.pdfIn PDF document text
    • http://dokuloraxu.22web.org/1782633983.pdfIn PDF document text
    • https://valejuti.weebly.com/uploads/1/3/0/7/130739952/tojusigu-jerutesiwa-gakijitilosok-lalepozage.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/jezitesiwofafidi.pdfIn PDF document text
    • http://gerakaxow.22web.org/pisugovud.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/5243248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_6008a628e51d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_601c8d22e2a19.pdfIn PDF document text
    • http://reloturuvum.22web.org/mazok.pdfIn PDF document text
    • http://tigoxudoxojiwig.22web.org/sharp_objects_gillian_flynn_show.pdfIn PDF document text
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/budutedowowojitefa.pdfIn PDF document text
    • http://xufegabuxugil.iblogger.org/94799401841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_602a1a2fbe7e6.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/8001620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://falivodekolulo.epizy.com/17251169806.pdfIn PDF document text
    • http://nazifaba.rf.gd/advertisement_template_google_slides.pdfIn PDF document text
    • http://xumasadepa.epizy.com/27011083161.pdfIn PDF document text
    • http://zanavaf.epizy.com/ad_hoc_data_analysis_and_reporting_tool.pdfIn PDF document text
    • http://bagomurugidapig.epizy.com/how_to_reset_time_on_a_panasonic_phone.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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5400 bytes
SHA-256: 5566ca48a476f6795d7a7668b2692ebdc0d704051c9de29da4b780e87bbb1717
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10608 bytes
SHA-256: d179f65fa3f6e31b586443a073d35b11942debe05f3d1d7636790c91d9b4425d