Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6889248a6df1e6…

MALICIOUS

PDF

70.4 KB Created: 2021-03-27 20:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c1ccc6605c23888d53a5b81dafcabc42 SHA-1: 715fff75bf65a07dd9eb662e71a551d7bf31a349 SHA-256: 2c6889248a6df1e666ddb6422115fe65588820c1e53eb3dc6de7137d1884ad1e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=neuroanatomy+through+clinical+cases+by+hal+blumenfeld+pdf+download PDF link annotation
    • http://komozazene.getenjoyment.net/turexubazoxonunabuxul.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/mejawabirudenanamis.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/7197839.pdfIn PDF document text
    • https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/5dd5d2cb3.pdfIn PDF document text
    • http://bujobatibu.22web.org/rbse_solutions_for_class_12_physics_chapter_16.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/1746128.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/032990.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/fegirogutezedaze.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/zofetamo.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/19152726161.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/6869803.pdfIn PDF document text
    • http://zesijesagevonot.22web.org/72122763557.pdfIn PDF document text
    • http://jofadebujidut.22web.org/vowofebebolejuromiposebix.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/5419581d2343ec2.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/04655f1ea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxenubegipus.epizy.com/zufozevisuzodovadope.pdfIn PDF document text
    • http://kitalanexu.epizy.com/a._d._g._c_criminal_full_form.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/83386139288.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/59845036161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606cdac0-4ffd-4f1c-a0d6-b3ce84104b77/why_is_my_samsung_refrigerator_making_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396868ed-b37e-4752-8dad-0526a42a7793/does_polaroid_snap_need_batteries.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/after_dark_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c8b274-d8d6-46be-829d-3c15de8bdc2e/guziviz.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_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 5872 bytes
SHA-256: bc2bf5b4d4e401fcd6b9bf88b3a64edb26c5a0da943cf032e053f860efe519f3
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 10460 bytes
SHA-256: 0b831212ddefa725a514d66a0450dff521ffb31a5e5130e5f84582928e910c7a