Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c308855766918c4…

MALICIOUS

PDF

76.2 KB Created: 2021-02-12 00:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: f9bddf366bef1d32439ee9cb5e060a9b SHA-1: 4c35b96ebbb02526c15ca78b9f6e60dc44c1179d SHA-256: 7c308855766918c4118bc83342e1487dc382c2f350258554b6569096c2534e47
264 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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=hoke+county+schools In PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/NgjTjgT/43277123938.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/dosafo.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/bYjjgfe/47529162746.pdfIn PDF document text
    • https://cdn.sqhk.co/wogebebaruro/epJijOc/robarijuwesadomew.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/D7iahYD/rowulumivutitumevirub.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hhihidc/jikoluvipadiganagepov.pdfIn PDF document text
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/c691ed19.pdfIn PDF document text
    • http://copyright-securityx.com/12381364230i1hr6.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/6907581.pdfIn PDF document text
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/fetejirakado-pitebazimova-pozon.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/milegawibulej.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/zitinibewabudi.pdfIn PDF document text
    • https://vanosejifewufe.weebly.com/uploads/1/3/0/8/130814052/08d5cd15941a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejeseja/krabi_thailand_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/tales_of_vesperia_definitive_edition_trophy_guide.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 4708 bytes
SHA-256: f758e6d964b0e2c5c057498bb7d47e3d34019203cb1fdd7ccd1b33d1ac0f4c1e
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 10788 bytes
SHA-256: 536988c12b1e95731f8d60b34efaab9b294d8e9fd49a56d49e0f8463ae4439c1

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