Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db94c4b7fc2ab7…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 10:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b80bf14558f421c20638244b5dc9250 SHA-1: 176520dd891412305f9455d874707cf85b316615 SHA-256: 18db94c4b7fc2ab73046d5a71a2c513c5b5a22ba6310f3dfd215f64f46a05046
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with one prominent URL pointing to 'seumenha.ru'. This heuristic, combined with ML and ClamAV detections, strongly suggests a phishing or malicious redirection attempt. Although no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these links, indicating a likely initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=signos+teatrales+definicion
    • http://pujasaros.iblogger.org/sql_guide_download.pdf
    • https://cdn.sqhk.co/wufotubi/iheicui/nunik.pdf
    • https://cdn.sqhk.co/rubuxupab/jh1Erji/ariana_grande_stickers_app.pdf
    • http://sibixujuw.22web.org/lusegokefinejot.pdf
    • http://fuwefepor.iblogger.org/jira_agile_reports_and_gadgets.pdf
    • https://cdn.sqhk.co/rebosuvut/zgEHjfT/gold_farm_wow_8._3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8a63eb76-11d1-474c-ace0-bf75dda73976/how_to_make_an_automatic_dog_feeder_with_timer.pdf
    • http://sojopisosifa.epizy.com/88543739634.pdf
    • https://uploads.strikinglycdn.com/files/3ecf6e09-89f8-48b3-bbfe-51022f4eeb2a/zamapobukonedokatetud.pdf
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_ebf5b779bbbc4e289fdf7486640feb7f.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_abef55d1aae442faaa544b7e21f820da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0932131-4a15-45f1-b527-a1e6f8b36b65/33476958321.pdf
    • http://sovijokidelaxel.rf.gd/samsung_55_inch_led_tv_box_dimensions.pdf
    • https://uploads.strikinglycdn.com/files/b85e7f63-b849-47aa-92be-c7af46e5fdcd/boxawawofifuw.pdf
    • https://uploads.strikinglycdn.com/files/405bc564-d1d5-41aa-a395-fea2e285ede3/graco_magnum_project_painter_plus_sprayer_review.pdf
    • http://xuwewajefifa.rf.gd/stock_market_open_on_veterans_day_2019.pdf
    • https://uploads.strikinglycdn.com/files/64abe91c-7b6b-4a57-a718-1d46fceece40/jizavusakuwagud.pdf
    • http://zasojogukumor.rf.gd/29713078121.pdf
    • https://uploads.strikinglycdn.com/files/b0f2a26a-c4ba-4100-9f03-d700f5928ce6/avent_sterilizer_instructions_3_in_1.pdf
    • https://uploads.strikinglycdn.com/files/d3c9c80d-9fe9-43aa-8e87-09d18572202e/89055438276.pdf
    • https://uploads.strikinglycdn.com/files/17c63d6d-76fc-46cf-9aa3-5d0ca248dde3/what_is_the_word_memento_mori_mean.pdf
    • https://uploads.strikinglycdn.com/files/5dbd3b9e-4584-4c30-9d5a-56e1eedd5396/vosogijoravev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2dc.bin
8bc56d4e5f8d0dde2bb3f745eba7332f7f74d6124d6c134bacbbd5a91a88758d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5080 bytes
font_01_sfnt_off0001041f.bin
fc379a774d1fba5f9a30a1e91b1463da350a4e15d6d389b65750f70662489c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 11772 bytes
font_02_sfnt_off000129bb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 4324 bytes

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