Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a55e0435af1825…

MALICIOUS

PDF

76.7 KB Created: 2021-01-24 02:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 13e9c300e14860277d2c34a6b38e38e5 SHA-1: d31471024f3c0abcaec5e75f0cc67e2bec8cbc35 SHA-256: 99a55e0435af18258a874f8116a992391d4b4e5ed8740c0646cd40067918b5d9
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs, such as 'https://jottigo.ru/aws?utm_term=abbyy+flexicapture+12+installation+guide', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/aws?utm_term=abbyy+flexicapture+12+installation+guide PDF link annotation
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/xogasi.pdfIn PDF document text
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/4426270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_600be29604d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_600ca465e51ff.pdfIn PDF document text
    • https://tipolapuponawog.weebly.com/uploads/1/3/2/6/132696210/jaroboruramelan-besutozezazibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fc8972dc8bd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471710/normal_6002787baedbc.pdfIn PDF document text
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/zudiki_lofawurominojow_wabisir.pdfIn PDF document text
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/e69a202724ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fd6e287821cf.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/vejutumega_zozokafowon_sejukilokiwem_domege.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/mukase_jatane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fd324a5e3263.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/d50fce4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5fe220176a04e.pdfIn PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/1411497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5fe704ce0a137.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/gomaxod/evil_morty_theme_guitar_sheet.pdfIn PDF document text
    • http://xokifenutotumu.epizy.com/cydia_app_free_without_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/25130668294.pdfIn PDF document text
    • http://pavasokunise.epizy.com/jemivatinajamoxolepebux.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/borderless_gaming_8._4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/24369982662.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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5808 bytes
SHA-256: 784b03859550bd8278acb19a3931b76d30efc0aee1f04e9fa8e843de8fe15ac8
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10872 bytes
SHA-256: 6fdabc51e77dc7d6cf13fe422b1de3965b4b85b90f6a19a831df21f40d82bd45