Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa553b6ae97ec01b…

MALICIOUS

PDF

70.5 KB Created: 2021-03-19 03:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02dfa278a8f31cc97ddcb3af863ebdb7 SHA-1: 85a7ba4c3bd7fa715a23890fca42b18629d95735 SHA-256: aa553b6ae97ec01b93269b99cec786d4490f2634ae94e5f7bcd799618a6553e5
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document, likely a phishing lure or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=pathfinder+roleplaying+game+player+character+folio
    • http://kazexajisodibu.medianewsonline.com/computer_operator_experience_certificate_sample.pdf
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/6b52f7f6940.pdf
    • http://zizopeja.22web.org/52361619797.pdf
    • https://pizufugutim.weebly.com/uploads/1/3/4/7/134723530/fegodef.pdf
    • https://cdn.sqhk.co/nonuripot/PidYZXx/gasare.pdf
    • https://cdn.sqhk.co/fifapupifig/jbOdosd/billion_builders_mod_apk_2._8._5.pdf
    • http://wirelessinfo.ru/lcd_tv_main_board_problemsdz8bn.pdf
    • https://cdn.sqhk.co/furafurume/ihhfibH/26518861994.pdf
    • http://procripton.com/steins_gate_ending_songfy7hd.pdf
    • https://cdn.sqhk.co/wixexozesila/jfEiaUr/vamavaji.pdf
    • https://cdn.sqhk.co/wipedekis/f0gc7ij/mineral_wells_tx_zip_code.pdf
    • http://study-english-04.space/43785444354hvq2x.pdf
    • http://load-bcp.com/go_go_scooter_battery_problemsjok8w.pdf
    • http://punavuvipufov.sportsontheweb.net/voparijava.pdf
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/wamabidajuko.pdf
    • https://cdn.sqhk.co/kuruwoke/jgPidhc/sosup.pdf
    • http://tohld.in/prvention_d_escarre_fiche_techniqueqqcox.pdf
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/kumatagu-pefebo-malikuravoxo.pdf
    • https://cdn.sqhk.co/kalusoxat/ig9hgLJ/luwonuboriz.pdf
    • https://cdn.sqhk.co/sadinuko/g9ZtVgT/pandora_s_box_image.pdf
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/5986906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekowob.onlinewebshop.net/wepaziw.pdf
    • http://zejaseli.epizy.com/edenpure_gen3_model_a3729.pdf
    • http://tifilumiteva.epizy.com/94543433525.pdf
    • http://refowinevog.rf.gd/anandi_vastu_download.pdf
    • http://kipafiperugava.epizy.com/selimijediwenefozolakazij.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_off0000d684.bin
da8bddae0e579ccced83b0b0baca49f80ed6ac47be765421043d6d3d38cfae0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 5492 bytes
font_01_sfnt_off0000e91e.bin
17ae3450834cc7e84f178aaae1b035029113c384133e5d6f38c0db51a8235ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10392 bytes

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