Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ba819507324a9d…

MALICIOUS

PDF

74.8 KB Created: 2021-02-26 06:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 592b6cffa18526320af0658897126293 SHA-1: f952f1d286333a2091ead95c7d805abc0281b9b5 SHA-256: d4ba819507324a9d1fc1b8d9158a5f6ae5d9307eb0157646c1d0bc2cea54602d
156 Risk Score

Malware Insights

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

The file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One critical heuristic indicates a mass external PDF link farm, with the first URL being https://s3.amazonaws.com/zexozavo/fifimulizokivijesa.pdf. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://druttle.ru/123?utm_term=cost+of+living+calculator+per+country PDF link annotation
    • https://fopabavegovos.weebly.com/uploads/1/3/4/7/134744375/7420119.pdfIn PDF document text
    • http://italiahot.space/11200921406u90sd.pdfIn PDF document text
    • http://3bureaureport.info/47460471127rwpyg.pdfIn PDF document text
    • http://strahuemsya.info/29517789766ii04h.pdfIn PDF document text
    • http://paksorond.xyz/33403765676fu08q.pdfIn PDF document text
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/ab1c58dd47b0.pdfIn PDF document text
    • https://bimidofun.weebly.com/uploads/1/3/4/4/134460432/3069377.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/443e08cacc370.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/kevogurifodazomitewa.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/431750bf64be8be.pdfIn PDF document text
    • http://ufenmac.com/rolling_stones_first_album_for_saleu4s0z.pdfIn PDF document text
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/7526163.pdfIn PDF document text
    • http://umdtheatre.ru/input_type_file_not_working_in_android_cordova503ne.pdfIn PDF document text
    • http://capridigi.com/diablo_2_cd_key_generator_26_character3p5df.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/zexozavo/fifimulizokivijesa.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/shimano_b-100_mag_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/libro_cagliostro.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/gba_emulator_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/peburis.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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 5248 bytes
SHA-256: f26c927bc395749b50a805c5bf856b89e2032dc717cbd334e01d048c1d78d726
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10536 bytes
SHA-256: 51b8587ab21f07e422c7fc23166553694d286a9e87bf424f4dfe4a162992e394

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