Malicious PDF — malware analysis report

Static analysis result for SHA-256 8826940e02c8d0d9…

MALICIOUS

PDF

80.7 KB Created: 2020-11-25 13:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0597566a2aa79f921a2ff6b337693ae9 SHA-1: b6c07ff011aaaefcc0fa8308456fb5736611c436 SHA-256: 8826940e02c8d0d95c29030a0a3557b98857bf953243e355856fba76339ca9b3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting, which are likely part of a link farm designed to redirect users to malicious sites. The primary malicious URL identified is traffmen.ru, which is flagged as a known malicious redirector.

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
  • 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://traffmen.ru/strik?utm_term=chapter+5+matter+properties+and+changes+worksheet+answers In PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/mepubovisux_zagudatodej_bawasosodep_jojabeneselas.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/visetilili-sowalog.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/cf86174bb52b5eb.pdfIn PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/9256469.pdfIn PDF document text
    • https://mijunijaxi.weebly.com/uploads/1/3/4/8/134865270/5975138.pdfIn PDF document text
    • https://nikalakikezune.weebly.com/uploads/1/3/4/7/134753818/7522091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f8e8e9e99e01.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/wafaribikova-xubotikomabana-zitanaxedaga-wukagogajuv.pdfIn PDF document text
    • https://gigomafokat.weebly.com/uploads/1/3/4/7/134717504/vedexarabo.pdfIn PDF document text
    • https://lusekovipe.weebly.com/uploads/1/3/4/2/134234723/7913219.pdfIn PDF document text
    • https://tetizapafatig.weebly.com/uploads/1/3/4/6/134634663/8aaeae4969.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/eb0207db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5fa7860966502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ac850d-86c4-4bcf-b81c-82f19d64a8ae/dajogene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f36d465-0269-4616-97e4-a1d8680f0393/pudab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14cd69f-fcb2-4751-a990-c14d98553319/forever_strong_pelicula_completa_espaol_latino.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5640 bytes
SHA-256: 28a94d3335b7b5d8bdeb02b71faedce75b9d2118356f803249ab38178acbdeba
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10720 bytes
SHA-256: b54c8db7a26a4199e563e094db3391724fcff04cebd02692c2cd48d8319f8118
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 17664 bytes
SHA-256: 2519b426e1fb6aaef89a5c567aab320ccc71d163b464040b2422c30b652c7c8e