Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d4138a7d95865d…

MALICIOUS

PDF

71.1 KB Created: 2021-03-15 12:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49a1caf0701982a5b7335b9b55ca043f SHA-1: f0f17b323f2f523356ed50c4486ea866ae7a0bd9 SHA-256: 51d4138a7d95865d473d3a428936077bb5fed8394737f30d7851ffce0d15b953
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://resalured.ru/wix, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=identify+the+controls+and+variables+simpsons+worksheet+answers
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/zebopemudof_faxazobeboxi.pdf
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/dad756a9c04.pdf
    • http://bagesopabiwub.scienceontheweb.net/best_non_bluetooth_selfie_stick.pdf
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/6091531.pdf
    • http://rezubodojel.medianewsonline.com/gubikavix.pdf
    • http://sazulido.medianewsonline.com/wdtv_live_firmware_rollback.pdf
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/6d5130c029df1.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/20d7aab16da0cdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dumupa/74647327798.pdf
    • http://kivozusemu.atwebpages.com/zolopitasugawedafu.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/67216437068.pdf
    • https://s3.amazonaws.com/tuzakifezara/mental_status_exam_speech_description.pdf
    • https://s3.amazonaws.com/benubapopikaj/apple_music_location_android.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_332381501ad6451eb8b0da3f0e2fb344.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/star_wars_jedi_path_book_series.pdf
    • https://s3.amazonaws.com/wefadep/smart_irrigation_system_using_arduino_project_report.pdf
    • https://s3.amazonaws.com/fatikonavori/26409135997.pdf
    • https://s3.amazonaws.com/temujonuwu/the_game_rapper_born_2_rap_tracklist.pdf
    • https://s3.amazonaws.com/vikukinumet/96085614675.pdf
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_202ecfe3f877434c8e91d24e2dbfda1a.pdf?index=true
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_547652061de540bd83d5b6f46d50b4cf.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d553.bin
39910250196d3b4aad857396065d9ac0dc1a9e95dff34a876e9f50480ad8926a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 5788 bytes
font_01_sfnt_off0000e8fa.bin
5edb8d5e063cb8b9cf24773476aa06e398f282cc321c2c783778a05a7f0b1c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 10824 bytes

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