Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096aec84ad4c2df…

MALICIOUS

PDF

70.7 KB Created: 2021-02-22 22:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 739c914459da94c1ca40de7a1b71be27 SHA-1: 990f523da85e4e9812f1f59f076302f8fbc52742 SHA-256: 4096aec84ad4c2df2be37004b85cf1ba3d49b210ba6c7ff485a7a52079d60699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jottigo.ru/strik?utm_term=what+is+an+example+of+sentence+structure PDF link annotation
    • http://setefigidoral.iblogger.org/39448595278.pdfIn PDF document text
    • http://xojudesabesone.66ghz.com/80652788610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6034181da7eb0.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/xutitixezipekagoxiz.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/zibefu.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/5c5b7a67294645b.pdfIn PDF document text
    • http://lbaranaydin.com/inner_child_healing_guided_meditationjor3c.pdfIn PDF document text
    • http://skameyki.club/401408877795zq8v.pdfIn PDF document text
    • http://wutulesarox.iblogger.org/zekojuv.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/sofavovigurexejigaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd1f4b154d15.pdfIn PDF document text
    • http://shop50off.info/sheetz_store_628lwajk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_601dc17bd23c0.pdfIn PDF document text
    • http://hookup668.site/chiari_malformation_in_older_adultsyx8c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_600126bea0595.pdfIn PDF document text
    • http://tesar-krd.ru/totitikulipapubojz95os.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosumuzav.epizy.com/yakushima_hiking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/bepovemogasokagemireduk.pdfIn PDF document text
    • http://legopabez.rf.gd/acute_appendicitis_pathophysiology.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5336 bytes
SHA-256: 50ad4c9413da974467a4bb90fd137eb834e9a69d0be385058226c60b73565a76
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10244 bytes
SHA-256: 9c9a8008976eb89541cb9c69269c8c10fc25e1a082fdc41428c575ff175b9727