Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6191c940e103da1…

MALICIOUS

PDF

72.3 KB Created: 2021-01-12 00:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 61e70eab436f4c89b2efb0d49d187514 SHA-1: 7634a055ae484936ce075ec6d6779ae016e06d25 SHA-256: d6191c940e103da16d99059ca823b6e8f428b340e3990023ad817d98280111f7
184 Risk Score

Malware Insights

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

This PDF document is classified as malicious, containing numerous embedded URLs that lead to link farms and known malicious redirector infrastructure. The document's content, though heavily obfuscated, appears to be a lure, likely intended to direct users to phishing or malware distribution sites. The presence of multiple links on disposable hosting and a link to a known redirector strongly suggests a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/aws?utm_term=tamil+christian+video+songs+free++mp4 In PDF document text
    • https://site-1174103.mozfiles.com/files/1174103/juwadororekev.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/47113612501.pdfIn PDF document text
    • https://site-1177706.mozfiles.com/files/1177706/fizidivitorolowuvageferek.pdfIn PDF document text
    • https://site-1177815.mozfiles.com/files/1177815/zotugisexetelifuteniraxug.pdfIn PDF document text
    • https://site-1175385.mozfiles.com/files/1175385/double_clutching_cdl.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/smalls_auction_live_bidding_tips.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/riwifavem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fa5785bc552c.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/8409405.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/sosapujubonadasexuvasijuf.pdfIn PDF document text
    • https://jixiriramoke.weebly.com/uploads/1/3/4/3/134320492/rowuguw-muzape-ziwodow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 5452 bytes
SHA-256: 8a56ba8afa3e2b8206b7499d4cf05832aba21a0108944db9d0cc07fdbdd26d00
font_01_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 10996 bytes
SHA-256: 6a5a33c1f9a42269defbe9da57a0b246edc9333062beb92874dfc40148f7b95f
font_02_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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