Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fbadec1775b819…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 19:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def78c1c0d5e2a9107bd83719a4ee822 SHA-1: 7c86cb6be12c0da24d95972138addca46b1f8687 SHA-256: f5fbadec1775b819ccc071a7b89756681db368a8a83de72daea34c8ae52f3a78
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs and a heuristic firing for a visual download button, indicating a social engineering attempt to trick the user into downloading a payload. The presence of external URIs suggests the document is part of a chain designed to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=mechanical+engineering+handbook+pdf+free
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/7408959.pdf
    • http://katalog-siberian-force.online/what_order_do_the_marvel_movies_go_in_chronological_order2sk61.pdf
    • http://fasad-dom.site/how_do_i_connect_my_epson_printer_to_my_wireless_network_mac96yio.pdf
    • http://chtotakoeverti.biz/zolafugkgah2.pdf
    • http://wedavinonuvovu.22web.org/camille_claudel_movie.pdf
    • http://digitalliteracyinstitute.com/1791338494658u9.pdf
    • http://tiktokhd.design/are_hunter_douglas_blinds_worth_itw5v5u.pdf
    • http://pumba-timon.space/what_is_the_setting_of_the_little_princeegkb8.pdf
    • http://shortsomfj.space/walt_whitman_high_school_calendarkbnuu.pdf
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/lotiraw_dalimalavoxaz_lubonunava.pdf
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/nivifi.pdf
    • http://accface.in/the_wrath_and_the_dawn_series_how_many_bookskcitx.pdf
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/83c907e3dfca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ganusigesu.rf.gd/chordana_composer_android.pdf
    • http://geralumumavol.rf.gd/rigetoduwewoxigowefoju.pdf
    • http://kekarizirisa.rf.gd/henry_luce_the_american_century_analysis.pdf
    • https://uploads.strikinglycdn.com/files/ade38aca-ed22-4c13-a103-fa99438c5d54/gubajekil.pdf
    • https://uploads.strikinglycdn.com/files/8751e5d1-8fec-44a7-9203-a431376534a7/icd_10_for_110.5.pdf
    • https://uploads.strikinglycdn.com/files/f44abb2e-333c-4b29-be0f-8f05d73ddcc2/truth_in_translation_play.pdf
    • https://uploads.strikinglycdn.com/files/2a4a9391-9857-4cb1-b583-927dda2e6938/when_the_sun_is_shining_through.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c5.bin
804848ee3212ca36b63a5f3e072a94ee1a47bafd2fb2c3c165e6a85f01eb7822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5448 bytes
font_01_sfnt_off0000f353.bin
863a6c167d34142f9e6c7a909123fa5f9ff02014e8d858a3828f708cb3382909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 11228 bytes

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