Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6ae444752fc449…

MALICIOUS

PDF

77.5 KB Created: 2021-01-14 07:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b0b9f09205d4251d74db1ec53b95929 SHA-1: 89c1f8beb07eb27bcc581084d3062b0eff88d29b SHA-256: 3a6ae444752fc449a06faa1fb21396a7bdbc21c7eaca788252cbf240f1f45a52
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?utm_term=web+quest+answers PDF link annotation
    • https://site-1173692.mozfiles.com/files/1173692/provincial_2018_equalized_assessment_report.pdfIn PDF document text
    • https://site-1180855.mozfiles.com/files/1180855/67642903089.pdfIn PDF document text
    • https://site-1201036.mozfiles.com/files/1201036/little_heroes_pediatric_dentistry_mission.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/critical_thinking_skills_for_education_students.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/cjc4Nhf/xexafa.pdfIn PDF document text
    • https://site-1173463.mozfiles.com/files/1173463/hku_food_and_nutritional_science_syllabus.pdfIn PDF document text
    • https://site-1206652.mozfiles.com/files/1206652/carx_drift_racing_2_apk_obb_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hhDhb1F/gerozujizisimo.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/xgdEFW4/76368706194.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/4dvMhid/malayalam_friendship_whatsapp_status_video_free_download.pdfIn PDF document text
    • https://site-1176005.mozfiles.com/files/1176005/t_mobile_phone_deals_iphone_11.pdfIn PDF document text
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/4df777ed1e9746.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
    • https://s3.amazonaws.com/luramamelolem/havering_sixth_form_college_staff_login.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/77413878457.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 4740 bytes
SHA-256: aae29370319a8bb705169e604a97f889f8dba80250104c455d825ded9ca3efda
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 11656 bytes
SHA-256: 0fed1e131fda8e38274d69a2a1d0b21fb0b535a3255fa3c52dceff325f14d7d0
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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