Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ceb525e3341f84…

MALICIOUS

PDF

81.6 KB Created: 2021-06-13 04:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 29969584ca70cb78e891a66f3b6e860d SHA-1: 4ee46f2a86e03f7959d3f5396c1a2f9b5a4385a0 SHA-256: 80ceb525e3341f8421ad1bc54520a37022e033dbe5fa899bfea76549dd45c88a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://cructi.ru/pbw?utm_term=mcu+timeline+movies+and+shows PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5ff91012b3838.pdfIn PDF document text
    • https://zidevikab.weebly.com/uploads/1/3/4/5/134576262/2b95a2118c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5ffe8eedf0e8d.pdfIn PDF document text
    • https://gixifufu.weebly.com/uploads/1/3/3/9/133999878/mujifen.pdfIn PDF document text
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/revixamijufuker.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/c737dcceb.pdfIn PDF document text
    • https://debekekuwafa.weebly.com/uploads/1/3/4/4/134473288/4222343.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/semisibuwimos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_6034dfceed960.pdfIn PDF document text
    • https://babidunilatejob.weebly.com/uploads/1/3/4/2/134266015/mafiguzowirow_rebogasimafur_raxojewarowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_6032cef5c9d97.pdfIn PDF document text
    • https://dupilike.weebly.com/uploads/1/3/4/7/134772583/vokizipalunopef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6788930-4cb1-44b1-8203-f875b9d57f00/space_flight_simulator_mod_apk_version_1.4.06.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c99ddeb-9d8d-4eba-8e8f-52650d6c6f36/pocket_primary_care_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e988cd12-9d9f-4d18-97be-16b1142f9b0e/linux_for_beginners_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1f8e8e-0733-4d68-a912-6c2c987ae434/pode_no_ser_o_que_parece_samy_dana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5175356a-b59e-4c34-abbf-e2a60981c1d7/selezide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8327a0ad-ee74-44c5-aeec-0499249df8ed/what_are_examples_of_metaphors_in_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba5c9fd-c5d4-4b9a-999c-493e8f2edbc8/vimexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f12d26-f678-427b-acb9-1f5743114355/resonancia_qumica_orgnica_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f5ad8d-42e5-4f28-a543-4d55d9e6ab13/36726219868.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5124 bytes
SHA-256: af0bc56d092daacced37fabc55d9e768565922374eb7afa2a2a13493ec9e3909
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11896 bytes
SHA-256: 27230dd2b4af8e0fed5df3d7cfd01f0c5c12e720b1b9f16786fe48d3bef8a31f
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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