Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fc14c794b52816…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 03:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09fd714d1b6ae2cbf1e673306ec48099 SHA-1: 27af91abee51821a46862746638d1a211885fcd9 SHA-256: 51fc14c794b528163cb6ab148a437e4dbd5e6c9deee23cf33b0b679c09cb46d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate reports. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://xezojetit.ru/award?keyword=laporan+auditor+adalah+pdf PDF link annotation
    • http://agencymedia-ig.com/govila6t8xu.pdfIn PDF document text
    • http://neojust.ru/why_is_my_petsafe_wireless_transmitter_beepingbcw2c.pdfIn PDF document text
    • http://prosucre.pro/xujof9clfw.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/nawukunu-zevoletin.pdfIn PDF document text
    • http://mscgis.net/jusevufetaduninojuju5xbpz.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/kidamomete_donikidixogamuj_zojusaroduzobit_sivulagepip.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/jininirarux-luvazigigex-mefax.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/refirupenimivawofaku.pdfIn PDF document text
    • http://bigmagazin.xyz/liputelinepitqgey1.pdfIn PDF document text
    • https://xominamoluz.weebly.com/uploads/1/3/4/3/134319977/3160611.pdfIn PDF document text
    • http://vittorguxx.site/99773634803rv5b2.pdfIn PDF document text
    • http://shoppingyxplus.xyz/wofenojatiwulivisu507g7.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/sikuva/vukolexifize.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/norazelur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c7d796-0ad3-4091-9f97-5f764812bc08/farinokawivikijafi.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/gmail_apk_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/android_pie_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1481a985-e2e7-411c-b1b6-cebb139830f7/38832343196.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/bajofiniwoman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8accaace-7783-44ba-8ccd-5040f43b8910/xazabuj.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/sefojelipakunolup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d0b1fe-b0c0-41cb-9061-230be7de5a34/is_american_gods_on_netflix_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/lujegobebedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63836168-b55f-4e07-8891-a2388178e968/msi_760gm-p34fx_drivers.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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 4892 bytes
SHA-256: 3dc472e436b7577ef892adef1453ee79dc1bdc2d9e81d6d70f418fcb37a4f5ac
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 10368 bytes
SHA-256: 214ccb27b67b26328fdd6c58ffc3593c94d1bcb1dcb943dfc0b1f5f93e8570d2

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