Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2d7046e6b53846…

MALICIOUS

PDF

89.6 KB Created: 2021-03-19 20:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5b214be2fa6c8cebf6b8071c09a4c63 SHA-1: a57345d64cd2cca483a2261b6927c8771012aa52 SHA-256: 3a2d7046e6b53846da6304c5ba1ad031c56c73f4e05275dbc9fab163f23d3345
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to press Win+R or paste a command, a common tactic to bypass macro restrictions and execute arbitrary code. The presence of numerous external links, including a link farm, suggests an attempt to redirect the user to malicious content or download further stages. While no scripts were directly extracted, the PDF structure and heuristics point towards exploitation for client execution, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=how+to+reset+pdp+xbox+one+controller
    • https://cdn.sqhk.co/dogilijesiwu/v1icsij/cross_color_leather_jacket.pdf
    • https://cdn.sqhk.co/xejudawadoni/etvK8hg/gomupekodutanowakod.pdf
    • https://cdn.sqhk.co/fazovivum/hgjhgeb/davomupajiradizuzakadudaz.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/749570.pdf
    • https://cdn.sqhk.co/sarimotel/h9Wjhic/directv_now_free_trial_20_charge.pdf
    • https://cdn.sqhk.co/gesuxafom/Zgdgfgf/4210908697.pdf
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/matomoriribon.pdf
    • https://cdn.sqhk.co/minamojazi/NfrMheH/janutivetediduvemimawa.pdf
    • https://cdn.sqhk.co/zefafulolit/ggKjh5D/beethoven_piano_sheet_music_moonlight_sonata.pdf
    • https://cdn.sqhk.co/suxujaba/CqieBgc/sipebasaz.pdf
    • https://cdn.sqhk.co/tisojubew/ijhcQie/4_pictures_1_word_game_level_23.pdf
    • http://sunobalizumona.iblogger.org/40328883157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ccd2ece58e374baaae151cef365b9087.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_0359187b9396493caa854847b032deb6.pdf?index=true
    • http://rokimaligevijep.rf.gd/viewer_toolbar_change_title_jquery.pdf
    • http://vegiziguso.rf.gd/nurir.pdf
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_b90527ae7777466981aac0c379c87021.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_dcb208bd0d7e4f5bb59286b546bb2ecf.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_38b608c83d664a1bbc41828f9098ea98.pdf?index=true
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_b27aede54a7849819a129acec6151e54.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_aaaa0e60d2f748f7bf1a584ffb44e1ee.pdf?index=true
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_4ec25b60659a40ddad68c4a3184831a7.pdf?index=true
    • http://tefasuxonekan.rf.gd/jomoti.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_off00011c16.bin
f523a085056c3ffd6560286df833aecdb6606bdfdac38a1f929b171dc497976f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 5116 bytes
font_01_sfnt_off00012d9b.bin
2cc6879e1ca85cca9588d6f10719f1e853949f38839d02f9c8a38ab2b7d2d67c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 13120 bytes

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