Malicious PDF — malware analysis report

Static analysis result for SHA-256 5904cf77f9f1fcde…

MALICIOUS

PDF

75.7 KB Created: 2021-04-25 11:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21fdc511e27bda868d13ce4bb136ae5c SHA-1: 8f66803851b6e5d95c740f286cee52023571407f SHA-256: 5904cf77f9f1fcde10c7cb6f67b7217bb26198905c01b30c50fb5ec89a180a19
186 Risk Score

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://crophysi.ru/strik?utm_term=how+to+install+britax+marathon+car+seat+forward+facing PDF link annotation
    • https://cdn.sqhk.co/lifupowaseli/fMKheQk/psd_website_mockup.pdfIn PDF document text
    • https://cdn.sqhk.co/bezupidokaz/rQ4hcpS/83059937701.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/eggqIgg/along_the_way_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jgipic9/budate.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/6twjDhg/66952994453.pdfIn PDF document text
    • http://wowitaly.space/babbu_maan_all_sad_song_djpunjab4r4su.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/jjdgchh/blank_risk_assessment_form_for_schools.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/ajaidie/paypal_phone_number_uk_helpline.pdfIn PDF document text
    • http://differencecheats.net/79929783591cl9jw.pdfIn PDF document text
    • http://canonsburglake.org/who_was_named_the_sexiest_man_alivehskj9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikusotanuw.rf.gd/76131406586.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_a5e0299efedc4f449f3b9d0c720dbc0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/wimaxujoxuv.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_7655cd3f91b64234a794a83c909851ab.pdf?index=trueIn PDF document text
    • http://fefamoru.rf.gd/orthopedic_clinical_examination.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_8034e0d760af49d18e719e59a1e189ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/63622682994.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/statistical_tests_in_spss.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

Related samples 5

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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5696 bytes
SHA-256: 275139c2d39718614d766eb1ef738b0cf2c658356cd248dd26f51c3cb774f0d6
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11036 bytes
SHA-256: db4996a0c37d4d1bea7861d5f65d5f5f59b8164644fcc05a4c1e3cdb0fe1464b

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