Malicious PDF — malware analysis report

Static analysis result for SHA-256 720d916c153dd055…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 01:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f64ba83c650a12310f16f3cba7fe5a93 SHA-1: 7cebd2269d05720fc46ee692bd4f29a7e37a8c46 SHA-256: 720d916c153dd055d7ade42f6461f51734452e0b071ad330f070c29d61a01864
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site.

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://fokemale.ru/wix?keyword=to+kill+a+mockingbird+chapter+15-20+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367283/normal_601ba9fa146ef.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/gq9E2bP/9216660349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_605a6026225e9.pdfIn PDF document text
    • http://iclod.tech/clarion_cx501_bluetooth_pairing_codelp5wy.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/64cec5e5d5.pdfIn PDF document text
    • http://24goodstore.site/sadijudaguveis5o.pdfIn PDF document text
    • http://fakts.design/tls_tunnel_premium_apkq9u3a.pdfIn PDF document text
    • http://healingtunes.ru/what_are_the_different_types_of_structure7nhiw.pdfIn PDF document text
    • http://golden-bridge.pro/25925578549xa1kg.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/jaiezjh/70636422571.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/3538093.pdfIn PDF document text
    • http://sy0n.icu/36601824580ngumj.pdfIn PDF document text
    • http://erogan-encolumbia.site/what_is_after_dog_man_fetch_22krkip.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/388812215995aidn.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/tutatarotajowoxi.pdfIn PDF document text
    • http://springwin.space/palijolozatippshuk.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/nYjc6jh/penakamuzak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c072638-c096-4947-a954-47cb54a2349b/how_to_fix_dripping_samsung_water_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552cdf3f-3625-4bda-a63d-5390ed308545/what_does_a_quick_study_refer_to.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_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 6224 bytes
SHA-256: e67d822e2586dbc15568192f04e4b273536d87c10a979cbbf18699f6c099b9a4
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10688 bytes
SHA-256: 2a829c0f8301b6a244978743a22ee11b36ef211ce4d9ef514de2cc88c44ce807

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