Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81a5e5c6e093ad0…

MALICIOUS

PDF

84.2 KB Created: 2021-03-09 04:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f0ca81a14d094dad9612784cfb558003 SHA-1: 6be14dec5e1ff43da4189f0936e62278eb48c85f SHA-256: c81a5e5c6e093ad02a11e273ab49c3033a19af57eb10ccad08a563577312e153
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with heuristics identifying it as a link farm, potentially for SEO manipulation or to distribute further payloads. The embedded URLs suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://seumenha.ru/award?keyword=article+about+inclusive+education+in+the+philippines+pdf PDF link annotation
    • https://cdn.sqhk.co/serodozire/thbigji/liwejapiboxudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_6045fbf81512b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_5fd7cde1bee8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_603fe8a043209.pdfIn PDF document text
    • http://stankoff.org/kindle_paperwhite_instruction_booksxexy.pdfIn PDF document text
    • http://belkwigs.com/zexivemiwitizigewu468r7.pdfIn PDF document text
    • http://mon-cmbretagne.best/customs_broker_exam_october_2015bn9xo.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/hgIwkgd/rewixozuzokopemuzoxavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_6014a3c36e886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5ff9e522d30ec.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/cqOFgjn/ledenosonotunirenajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_6035b651be7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fc864266f1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_60357f5f9d1cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_601ef1f87dbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fdba749b7a73.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/XUk41hj/xiguduterenesuxujigafido.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/limepusotanal/blackpink_lisa_images.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/ccrn_cardiac_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/28747823008.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_439d220983f64db4b152246bda15ae55.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_d8780134d634487da8faf2e015c2a4c7.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_1dd5d1f235d141de904abdada0ae2b2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/alvesta_station_platforms.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_88e5da27087f49098b04b55060998da3.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_b14c812874bb426d95e1f1964cb1605f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/kufiwena.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_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 5432 bytes
SHA-256: 363c72ab3b3897aaad67ab5d164bba68dfdfd166ca5fd73dee864adbd37c6b47
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10456 bytes
SHA-256: a87011f76a58bca5425b525452511be2bf375f7eb5c880bdde0668e4af9e8756

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