Malicious PDF — malware analysis report

Static analysis result for SHA-256 5221792b97bdca31…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 10:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fcc3d4c023863c2f32b81991b9da0b2f SHA-1: e8dbf1a452ec802b0af03f678b35c60afcbb9b9b SHA-256: 5221792b97bdca31ae9f695060465e1c328e78a44a71c6e8decb0615084d29d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=algebra+nation+section+1+topic+7+answers PDF link annotation
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/sedazejesazuvoraliw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_5feda609bea6b.pdfIn PDF document text
    • https://biravozoso.weebly.com/uploads/1/3/4/4/134400929/aa6cbbd4021.pdfIn PDF document text
    • https://wulukapuw.weebly.com/uploads/1/3/0/7/130740123/junidab.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/ce477d14d40c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_6041e7dcc0009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6024ac779339b.pdfIn PDF document text
    • https://pozuxona.weebly.com/uploads/1/3/1/3/131398461/xasaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_60544da690ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_604513879db6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_602b400b13a6f.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/jiliverukizowawagaso.pdfIn PDF document text
    • https://gawejewigedek.weebly.com/uploads/1/3/2/7/132741035/kuxog-molodo-bixikuroko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_600bd325c8e37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_60016fa4e87fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_60509922c5c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60338a8ee90fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_5fde886e339ca.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/depes_kawun_xiluteguzow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5ffec155e704f.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/joges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 5452 bytes
SHA-256: 0678356a2863229ac542b5d582c28538f25a3b1624c7d5d305f95acbb6faa224
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 12744 bytes
SHA-256: e5a05c5aedb7ce2f0369074311e9df567b3f7e67aa98edda4c3f73c87d976f03

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