Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd5a6d46f70408d…

MALICIOUS

PDF

74.7 KB Created: 2021-01-26 10:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e0c950a4e9303fd836418eb5622678e SHA-1: 21ce9c11c5344bd0970f86f7a547067729d73fc6 SHA-256: 0bd5a6d46f70408d9824b377f7e52e183eb5223cbde99fe1a672a8d84f138e7d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable or part of a link farm. This behavior is indicative of SEO spam or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/wb?keyword=dancing%20line%20music%20names PDF link annotation
    • http://proflist-barnaul.ru/freeroam_city_online_apk_hilesuom9.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/detozofono.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/1129825.pdfIn PDF document text
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/9925515.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/jonov.pdfIn PDF document text
    • https://letobepep.weebly.com/uploads/1/3/0/7/130740206/478a3c.pdfIn PDF document text
    • http://skidki-day.store/facebook_portal_tv_cyber_mondaya1jco.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/xipugufuv.pdfIn PDF document text
    • http://yblda.fun/guxevopumopolp3lmh.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/tulizifolize.pdfIn PDF document text
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/8425627.pdfIn PDF document text
    • http://sale20.site/real_bike_racing_download_mod_apkokafy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fee1e87db398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5ff1531c3d8e1.pdfIn PDF document text
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/tanewubajapabobaleka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6009fe6520100.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/5d010f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_5fd74129708a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 4712 bytes
SHA-256: 142a494a69314adb33b6f7abdd95986ae42a2f029261aabe6daca15361530ff1
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 10428 bytes
SHA-256: d83628d10f54badc92c438ba8e590af0d9a46b89c66eabf9dd4e785f6bf0b778
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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