Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29507e73729f335…

MALICIOUS

PDF

72.4 KB Created: 2021-03-15 11:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6de0a7144d6fe3b03af85b2734c86611 SHA-1: a33985e76ca59b64c477eec1a3ab676be73d5222 SHA-256: b29507e73729f3358405c8723bc5a11397ee7143fe5317f3cc98ea656965a23a
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://baarspo.ru/wix?keyword=the+mole+coloring+worksheet+chemistry+answers PDF link annotation
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/tudakudusogarinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fdd41764566c.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/gfhjChg/modabesutemafakesederuleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_602f7972acb8e.pdfIn PDF document text
    • https://batuginuvitewaw.weebly.com/uploads/1/3/4/0/134013132/xupatisoniv-nixemadixijov-nuwijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5fce794abfccc.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/xulazoxuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fefa8dded93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60141152bbd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6028ac7278e77.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/eZ1idjg/turibuseborekusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_604d1017037d2.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/3557928.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/idjhZ61/49542418831.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/xamapebonijos/washington_state_university_tuition_2020.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_84d9ab49923944e99698d6b74b4a556c.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_22dd098e6ff747a1b90b7e05a1d48169.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mosezavor/how_to_perform_survival_analysis_in_spss.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/fejefukalogiteleju.pdfIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_752d8af4618c45b89f707945aabb4564.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/experiment_19_charles_law_lab_answers.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 5420 bytes
SHA-256: f15127831bcef5a7346100409bbccf82a0e5e2fd3ef31602e57b9eb9c9e0d7ef
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 11584 bytes
SHA-256: 7baf15a16c68e2d4852344a24697a4881852dbbc702f5a8a9ace4dd3b0430d6d