Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b07a527166f6a8…

MALICIOUS

PDF

106.5 KB Created: 2021-03-18 02:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19ce1eb1fd0aeeae4c5c9b389a4cc58 SHA-1: 99ffccd5a742eac7e396e6a8ce0af648a2e33caa SHA-256: c4b07a527166f6a8f205efd3eede32a04e7161a2729c934187b0ea4585979a0f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of the 'SE_CLICKFIX' heuristic suggests a social engineering attack designed to trick the user into running a command, likely to download and execute a secondary payload. The embedded URL points to a potential distribution point for this payload.

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://bologen.ru/award?keyword=arduino+pro+micro+pinout+pdf
    • https://cdn.sqhk.co/mewobonovagi/ajeibif/jobesoron.pdf
    • https://cdn.sqhk.co/kujaruwajovi/ifhgfjg/moto_traffic_race_game_download.pdf
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/rubun-polukikebusu-buxan.pdf
    • http://xivobivivupe.mygamesonline.org/what_causes_your_scalp_to_burn_and_itch.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/19da48e8ae27.pdf
    • http://tozemudezajif.mygamesonline.org/volume_formula_worksheet.pdf
    • https://cdn.sqhk.co/vugomupuzisa/shghbig/icontrolav5_android_9.pdf
    • http://sport-stavki.fun/where_are_my_hidden_pictures_on_iphonehk0wt.pdf
    • http://mebel-albero.ru/gurodajuvinadv1398.pdf
    • https://cdn.sqhk.co/bogovureg/vja7giH/management_consulting_internships_melbourne.pdf
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/jitojufilakigarod.pdf
    • http://kersita.fun/injective_and_surjective_functions_pxrzwl.pdf
    • http://extrameets.fun/16296227011t7kxm.pdf
    • http://duwelizub.mywebcommunity.org/jee_main_b_arch_question_paper.pdf
    • http://noverst.xyz/gaziromovegeke34h1p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jebupofedijakuk/pulagatew.pdf
    • http://kivarutumo.myartsonline.com/autocad_electrical_free_download_for_students.pdf
    • https://s3.amazonaws.com/fedure/possessive_pronouns_spanish_worksheet.pdf
    • https://s3.amazonaws.com/vavejijitatofu/bartender_the_right_mix_2.pdf
    • https://s3.amazonaws.com/bisazabe/cdc_travel_information_mexico.pdf
    • http://jalijoruki.atwebpages.com/the_aryavarta_chronicles_free_download.pdf
    • https://s3.amazonaws.com/sevoga/jufotazemaz.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_off000162a1.bin
fcba11dc8633bbcb4614211d3a619576ae14513b3dc4f78f5069ce6145b8dee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162A1 4872 bytes
font_01_sfnt_off00017324.bin
9c976d5213b904fdaef0c0c0ac1bb5308d302ad710a68ce6d356a17d966816b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17324 12272 bytes

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