Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1df3b550076d45c…

MALICIOUS

PDF

71.5 KB Created: 2021-03-03 05:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: ce5fb1c1b529f0243805311166e3734c SHA-1: ccecf277b4b58128396dcc031f18daf2b03ec170 SHA-256: c1df3b550076d45c34dec37d8a77f747d4814f82f44eeb34fae828e296ed30b4
192 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=design+of+concrete+structures+nilson+7th+edition+pdf+free+download In PDF document text
    • http://helpcontactform.com/woxuragibopovoxevajnq2s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_601f14c87cd37.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/bbpigja/67519861884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fde582572ca2.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/pl_sql_developer_tutorial7p9e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5ffbc07ad13f9.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/cjbghii/anchor_cross_stitch_patterns_free_download.pdfIn PDF document text
    • http://katipef.medianewsonline.com/fred_factory_orders.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/gjB4hfy/90140085703.pdfIn PDF document text
    • http://3203epworthcres.com/jazomukotulaxujadazu6wwz2.pdfIn PDF document text
    • http://zoom-omsk.ru/590221383004d5te.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fef3e1b2193b.pdfIn PDF document text
    • http://zesamoa.online/sql_basics_free_download612n4.pdfIn PDF document text
    • http://50offshop.info/changing_fractions_to_decimals_worksheet_grade_6rgt93.pdfIn PDF document text
    • http://normal-id.com/305289082131jvjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5fc6cb361034d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fd8248a11d5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerowegujij.onlinewebshop.net/trading_and_exchanges_market_microstructure_for_practitioners_github.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5588 bytes
SHA-256: 426604a10d4419fdc4b8324b3b5f3fc9c09cc42a9e90c88f0eeff9a8dad31653
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10336 bytes
SHA-256: 627b213b6b11ad90aa0e9753feadd767ed1f70f722cbd0b6ca8a53973f9be8cb

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