Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5919956d7309b9…

MALICIOUS

PDF

95.2 KB Created: 2021-06-04 16:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8f6f2ee9862ecd4d0b739d0372a4ae90 SHA-1: 98d606245e92f2aa2b2cd074e0cc3a75d27b68a8 SHA-256: ae5919956d7309b9e77640663e11bda41d9aecc250767f4c4077416b823f40f3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external URLs designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://pistant.ru/pbw?utm_term=speed+control+of+dc+shunt+motor+using+thyristor PDF link annotation
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/jetenibumogad_patezeg_lulasure.pdfIn PDF document text
    • https://roxabagoxe.weebly.com/uploads/1/3/1/8/131857818/1122866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503387/normal_606b67f8d1b0c.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/8bd43b586d52c2a.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/8147302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_605a1ec5afe4e.pdfIn PDF document text
    • https://palekanino.weebly.com/uploads/1/3/4/3/134372766/lijif.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/809612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5fcb17bd6f721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fd28cdd87769.pdfIn PDF document text
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/1795066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60622154f2462.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/fulafeferuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeselivid.pbworks.com/f/paypal_money_adder_apk_download_no_survey.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144592683/minecraft_free_download_java_apk.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/f/60120827753.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144423651/muferixabenekux.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/how_many_points_is_a_straight_flush_in_cribbage.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144524997/26139972138.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/87296753638.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/f/can_i_get_thailand_visa_online.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/what_are_the_advantages_and_disadvantages_of_presidential_and_parliamentary_government_systems.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_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 5564 bytes
SHA-256: c6101938025414a412b5a4ec2d99edd05284c380605a209f8cc93442c5c6dfae
font_01_sfnt_off00014481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 12612 bytes
SHA-256: 380da6cd9793257de354fa244d275fed1770afca8898a0fe45bcc1dff64861f3