Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2135b50de22d70e…

MALICIOUS

PDF

71.4 KB Created: 2021-06-01 06:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e31714b4a6227c92d5db2cad7d29117b SHA-1: c9b2b093545d6235bd330a2f21c2e661c07fdbdf SHA-256: b2135b50de22d70eaaa944c9a162d3758527955ac10133865cfb31b6e535b5d3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=how+to+pair+heyday+bluetooth+earbuds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6061cd8d73780.pdfIn PDF document text
    • https://jesakejijubew.weebly.com/uploads/1/3/4/5/134577011/1498373.pdfIn PDF document text
    • https://xuratofojiwob.weebly.com/uploads/1/3/4/0/134096374/dagogivojos.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/6ea9fc23ff26a38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_6008a401b2a4b.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/1411511.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/7a6ba26648db2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5ffda104af8b3.pdfIn PDF document text
    • https://janiwekogakopa.weebly.com/uploads/1/3/7/5/137500868/tipexolosarupo.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/lijenutujuf.pdfIn PDF document text
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/vezazuniboxisapal.pdfIn PDF document text
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/8902121.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/cdc48757-e20f-4c00-af4e-62b6ed999572/what_is_a1c_range_for_diabetes.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/w/file/fetch/144437985/libros_de_la_sep_4_grado_historia.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/waec_further_maths_past_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ceda78-136e-48c7-aaf4-eec760ecf89a/watimujagod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c50f9a-b12f-4c34-8712-9bf92ef38bd5/manual_guitarra_espaola.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/dictados_para_6o_de_primaria.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/how_do_you_alliteration_in_a_sentence.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/office_2010_activator_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1836063e-1c69-429f-bc2d-99ffe081dc46/how_do_dolphins_help_the_navy.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 5344 bytes
SHA-256: 200f1dbd5c5efa25d86d38ebcd8761da40de9a03162c68b862701356258ea18c
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10704 bytes
SHA-256: 837ceceea5f0c2b970c5e96bca7949a3a6e5da025a0dfc7fdc848b60c583b29d

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