Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7f285b2b946b2…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 14:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: be1952921639267984e8618e1d1346f9 SHA-1: 9dd35ccfded2fc171ec3c7cc8515ac1ab497d3f2 SHA-256: 83d7f285b2b946b206fc7344395ac9568bbe7b436b77178fd70d079f231d04aa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous malicious URLs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://dafemum.ru/award?keyword=cambio+climatico+pdf In PDF document text
    • http://forkidsshop.online/water_bottle_label_template_psdw1fwk.pdfIn PDF document text
    • https://cdn.sqhk.co/tesuvifiv/bjcgjkQ/352242014.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/UXIeYRx/95643854032.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/brandywine_boutique_bbb.pdfIn PDF document text
    • http://frukt.fun/wordpress_plugins_for_ecommercevq4t7.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/why_is_my_mobile_hotspot_not_working_samsung_a50.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/ap_sakshi_news_paper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/hCggyib/chase_mobile_digital_wallet.pdfIn PDF document text
    • http://bluhgang.best/479425516263v1t0.pdfIn PDF document text
    • http://realnoe-obshenie.online/child_care_center_daily_schedulelfqyq.pdfIn PDF document text
    • http://prechambre.xyz/girl_interrupted_trailer_legendadozr010.pdfIn PDF document text
    • http://evatopshop.xyz/pikejojumafanoduhx9ov.pdfIn PDF document text
    • http://santand-es.com/kavubifapofgcfkd.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/LhdAget/balanukonovidomomuz.pdfIn PDF document text
    • http://bazis-rostov.com/702075427548w0lu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_d25d7ad0b8fe453ea9c496056951c6a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845097b-50d7-4c7f-838a-0b0095f326e8/dungeons_and_dragons_5e_starter_set_rulebook.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_cca4a51bf83347c48bba9ae9b7582dee.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_c0590305153f449992586040a9fdd117.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_bc2ff605028b4f25a92bb8c70ec23363.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05a48c8-8fd6-47c3-aaae-3c8627f86c45/lolajupulejizid.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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 5072 bytes
SHA-256: 9edf186b7aea2c45f44a1cbaee3af537798baa9ad2eb5d257fa6f4a39cd4a3f8
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 12196 bytes
SHA-256: d9198468954e805d136f64820122a249eee3eb801504fd5685dd22dc3f79f7cf

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