Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ff6236e4380f56…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 21:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c71532dad622e030804c1814d75b78a8 SHA-1: 4e694e134edd49d672b8008e546e28aab26ac4ac SHA-256: 34ff6236e4380f561a90a2202d0a4284a528bfd4f367e2f1ad16e5c630426eec
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to link farms and SEO redirectors, indicating a phishing or scam campaign. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/wix?keyword=apk+gta+4 PDF link annotation
    • https://kanevedodusuwa.weebly.com/uploads/1/3/0/8/130814441/4ae5560f3.pdfIn PDF document text
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/posedopafaro_jurulofu_fujorexodirama_ruvegisefin.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/pupikomezikoke.pdfIn PDF document text
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/retuv_xixategosutiwun_lagamo.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/gifip_zuwizevemumol_lesunap_velaporab.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/tuxeva_vuwejapafe_renuxomililis_jotibo.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/3202622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_a7bc6b2c1aff43e688cffb58f7f4945b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/time_and_attendance_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/dilotizosifu.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_019e5c77520449ef8ea63934df492d60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/5th_wave_cast_list.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_a0b0cd21643d425fa558f67cf1fe8dec.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_95bb8388a0504b739138916494c4991d.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_56c7f634ce7f4ed682528a0379b067d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/score_football_game.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/colors_kannada_voot_app_free.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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 4820 bytes
SHA-256: 84b63a7ec8130133656a3c4e54206f5cff57f5ed9c5a12367fe841357e817015
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 12064 bytes
SHA-256: 6bc1a04b5c94aab499593507f39e09fef785831ef594e9a27431d223a49813ec

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