Malicious PDF — malware analysis report

Static analysis result for SHA-256 a772b01cab77f40e…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 23:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 24d7e269ee22c90c67bc402ae8c9a83e SHA-1: 6cab314d4fc2756fd30e30eb89a5077871dbdbd6 SHA-256: a772b01cab77f40e26bed196690125a175746f2760c8c90097d90f8be94c8679
244 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 links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The embedded URLs and the link farm structure suggest an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=are+you+my+mother+book+level In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6024a6e89eebf.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/lagibasuwopen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_5fd5f130908cd.pdfIn PDF document text
    • https://botutubinev.weebly.com/uploads/1/3/1/6/131637728/titan_nizin_wolekuzutidudug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_60147e5947b98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_6007426de5367.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/noriwodode_kotavutarofixa.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/gomel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_601852da4b801.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/nenixalusako.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/danalemajujewa.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/devur.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/kowurofonosebesaka.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/jidagafinuxesu/24274858542.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/wukopul.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/limits_of_functions_worksheet_with_answers.pdfIn PDF document text
    • http://punexowimuseva.epizy.com/non_ppr_fantasy_football_cheat_sheet_espn.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 4892 bytes
SHA-256: 77f50af13ccc78388eb161712add23acbd244f4dc4ed3da862cdc33061c942c6
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10568 bytes
SHA-256: 1621a3e2b4ba557bbfc00cf7278d0653d25c11b06a094e21ae7599a53709211e

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