Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dd65679fc3a95d…

MALICIOUS

PDF

65.1 KB Created: 2020-11-19 20:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f8ea343f717bd8d222a212a55679768e SHA-1: 1739711c83264d17f42634bf29f8a425d623bb6d SHA-256: 49dd65679fc3a95d396872cbf2aa9b410c16643106e2d9ea06b3e56d3d169ef4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. One prominent URL, 'https://trafficel.ru/strik?utm_term=gradiente+divergencia+y+rotacional', appears to be the primary lure. The document's content, though heavily obfuscated, suggests an attempt to disguise its malicious intent by presenting itself as related to 'Gradiente divergencia y rotacional'. The presence of embedded external links, including one pointing to 'https://s3.amazonaws.com/tazibabebap/polk_monitor_70_11.pdf', indicates a strategy to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=gradiente+divergencia+y+rotacional PDF link annotation
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/5271742.pdfIn PDF document text
    • https://zinixukugezevul.weebly.com/uploads/1/3/4/6/134612333/1292306.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/tazibabebamep/polk_monitor_70_11.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/moto_rush_2.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/expanding_your_horizons_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efca6d4c-f9de-4e2f-98f2-463619d13c9b/nozesegaxuzogejazara.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/1995_buick_lesabre_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e7d3c3-0fc5-40d8-aeba-2700d8ba2a69/1181171021.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/duwezevuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7808a3a7-5782-4c84-abb4-846c3c197306/underemployed_part-time_workers.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/algebra_all_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/cuisinart_dcc_1800_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/64057597247.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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 5124 bytes
SHA-256: 9ca6b96352ff18fee7ad019f05b699c3a3797c2fb16c8910b79a3d8a64d8857a
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 10644 bytes
SHA-256: 0e70eb3a48bae52c6c0402f02eab5e4a65fd5ba48b5f8ca12e76aafeec81d4d3

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