Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9a8f7742810a0a…

MALICIOUS

PDF

83.5 KB Created: 2021-02-21 11:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c8262d8f1f3e33709cc1f00b59cfb68b SHA-1: 63c619faed31e08b2e3f31388a09ec0184c2129b SHA-256: 4f9a8f7742810a0ab73f548adcdfd83e74db72b16b79c685e1015e322373f937
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to graphing functions, likely used as a lure to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://druttle.ru/wix?keyword=graphing+linear+and+quadratic+functions+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/gasubapo/higipij/best_men_s_shoes_for_fall.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/idjjgiN/dolafede.pdfIn PDF document text
    • http://bathforlegs.xyz/lg_direct_drive_dishwasher_error_codesjs45i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5fc644460a36d.pdfIn PDF document text
    • https://bamigabimav.weebly.com/uploads/1/3/1/6/131636977/vozeneva.pdfIn PDF document text
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/kevivelijekukowe.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/kowabivuw.pdfIn PDF document text
    • http://sodaapp.club/37016793048f6oxk.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/jduphhi/permgen_space_tomcat.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/sinogozikirubas_sowadegixetim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5fd80af3aa736.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/5927872.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/nejoxa.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/domegagowevag/56153894762.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/jovefofem.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/lolikani.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 5728 bytes
SHA-256: bdb7b82f70f591fa24791ff336ee8ce568780eae3b6edf1322e6fd4199682b6e
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 2484 bytes
SHA-256: 3957183e8ce92d98792d4d932155d0057f4773d25fcb72ecf8e2056c5eb9c99e
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10800 bytes
SHA-256: 3d8fa7b1208025845cc6a55166728d3381992e084d9e7c71459ce226517aeed7
font_03_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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