Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a99abb83bb8b23…

MALICIOUS

PDF

74.9 KB Created: 2021-05-29 22:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4f00a57d5592f00b9f53f15e600bd2d1 SHA-1: 80bd04d9126ac24d753fcf936a8b41ed43134409 SHA-256: d2a99abb83bb8b23cd1c99995c08fa60b4a465e542cd49f8c6bd935d7d8f1aa2
206 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to URLs and application names, reinforcing the idea of a lure to external content. The presence of numerous external links points towards an attempt to direct users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://mezovuduw.ru/123?utm_term=allshare+cast+apkmirror PDF link annotation
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/9167517.pdfIn PDF document text
    • https://sumigixutaruxaj.weebly.com/uploads/1/3/4/7/134748626/4977193.pdfIn PDF document text
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/3e64ba04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_60102ec8c92fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5ff6d3b64c785.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/1714387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fd1960648307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fd779c45d967.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/2e16b5.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/zugerumafakalu_tawojutitoju_gajawemofejote_nukolap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_603268368055f.pdfIn PDF document text
    • https://bapiribudiwapik.weebly.com/uploads/1/3/4/8/134885568/sujuwutuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60682d609569b.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/musolukawekuwuvasoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_605c1673002ec.pdfIn PDF document text
    • https://pepagefowajuna.weebly.com/uploads/1/3/4/7/134738543/xidavulep.pdfIn PDF document text
    • https://madudezogimune.weebly.com/uploads/1/3/4/3/134326665/xalubati-ragogufurevom-lejewojinino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_60279ef262fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_605561c8d733d.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/xosug_meruwutusod_waxobizuxuba.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/f0ee8f98-78b2-474f-abf3-5711268d5ae9/what_supplies_do_you_need_to_detail_a_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4c6d70-d57e-418d-aa5e-6e4a5e87108a/kevexen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8554ca-a84f-465a-aa39-547caa2df0ef/15865076185.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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5224 bytes
SHA-256: 2424a332f83697cf7ff4912a6740b3db8bdbd3305181f27279edf4ea458b88c6
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 11576 bytes
SHA-256: eeda0edcd10b0e2538c23067658b3c1ba8dcc12aff2b6ed6d0065d504707724e

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