Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fd895800538357…

MALICIOUS

PDF

75.0 KB Created: 2021-06-04 13:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c2761f7c2bc14f41174f1166e58c3a2b SHA-1: 200f16734b8e12fd7afd62e28ba50d6906bd7ec9 SHA-256: 13fd895800538357821747281c41611c6a9d2b7d1fc46ab5500a8583f1477cae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/pbw?utm_term=club+car+precedent+gas+rear+end PDF link annotation
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/vemewamixare_jumejapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_6009cb46aacfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_6035111c8d626.pdfIn PDF document text
    • https://noxigizafovezad.weebly.com/uploads/1/3/1/4/131438329/24521b.pdfIn PDF document text
    • https://gobazivow.weebly.com/uploads/1/3/1/0/131070387/kajenum.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/muginawaluxuna.pdfIn PDF document text
    • https://xafokevixutevib.weebly.com/uploads/1/3/2/6/132681308/zelesiwimudukokulipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_5fdc099f56598.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/dd102.pdfIn PDF document text
    • https://dopesijej.weebly.com/uploads/1/3/4/6/134612330/ed0271657beb616.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/b141506b4d82c5c.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/ea0263099e3.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/1791556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_601fb7318d76c.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/38bcf23c-a550-4297-95c4-63524c84a1d9/best_irobot_2020.pdfIn PDF document text
    • http://sawanixum.pbworks.com/f/diep.io_mod_apk_unlimited_health.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/f/can_i_trade_penny_stocks_on_robinhood.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144452475/98070527105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e9766c-89ba-4c3e-ac84-30bc90a475e8/40438358284.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/zokiwoveradumamev.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/70568641669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53739152-310d-4d45-bad8-a4425a62db4f/how_to_determine_transformer_size_for_outdoor_lighting.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/jurivubepimigunali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e267cbb2-2dec-4316-b187-d6ae86e0fe00/79081963439.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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5288 bytes
SHA-256: 00b93aa571cde612e3584fcfeec38b6cab1808a76c4d0e897ae9f174896d10c4
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10376 bytes
SHA-256: 43eaf1984f35974d8da94d0a9e9bd0eb67a1244038389835db74f96aaf99bce0