Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa34f31a2ed2da11…

MALICIOUS

PDF

82.0 KB Created: 2021-03-26 11:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86546f69bc3186925aa89b411aa65808 SHA-1: 91c67f4340bb36e63abc55fcb770bb2f40e6283b SHA-256: aa34f31a2ed2da1157c82f5ce0f7e7eddd357215a59291833d51798015e9c604
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/123?utm_term=white+precipitate+of+barium+sulphate+is+formed
    • http://golivexi.22web.org/92886306096.pdf
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/nijonorepebidapaxago.pdf
    • http://fejugutafilevin.scienceontheweb.net/anemia_hemolitica_clasificacion.pdf
    • https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/vutezoxe_mabos_fomewa_kekikofevi.pdf
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/loxufipu_witojedufoweg.pdf
    • http://lunagogafoxoj.sportsontheweb.net/wagewunofizer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mosasawimip.epizy.com/16440413257.pdf
    • http://milebulijulami.onlinewebshop.net/43978161467.pdf
    • http://xenavak.rf.gd/96772842676.pdf
    • https://s3.amazonaws.com/viregujipowuru/44006256512.pdf
    • https://uploads.strikinglycdn.com/files/dbf274cf-1b23-4f19-abbc-351c1e13b2ac/mudinuvaxulowenuvuzotokuf.pdf
    • https://s3.amazonaws.com/sukobogixe/81562194680.pdf
    • http://matavun.epizy.com/dd_5e_rules_for_rolling_stats.pdf
    • https://s3.amazonaws.com/zobuwubedak/50354703487.pdf
    • https://s3.amazonaws.com/sugowubuf/roduzojilutexamejus.pdf
    • https://uploads.strikinglycdn.com/files/411dbe95-c4a0-40a2-85f8-27d395f53b60/2825313100.pdf
    • https://s3.amazonaws.com/zarelusipofox/1749273508.pdf
    • https://uploads.strikinglycdn.com/files/13435392-1de7-4350-929e-2875fb2f8593/xedesanemubojuliw.pdf
    • https://uploads.strikinglycdn.com/files/47885e76-ffd8-424b-b6d4-d3910bf70c93/new_england_bees_tyngsboro.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/android_app_development_course_in_urdu.pdf
    • https://s3.amazonaws.com/vuterijoze/compare_and_contrast_worksheets_for_6th_grade.pdf
    • https://s3.amazonaws.com/jubiferekaka/69194085603.pdf
    • https://uploads.strikinglycdn.com/files/00fde0c9-7098-4644-9b6c-c92367ebabf1/2457126133.pdf
    • http://pizenusogusu.atwebpages.com/17004111148.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabb.bin
deb00ea3349a3e36263a31d45d84d5983d548f92ce060dbf8196e3baac518501
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 5548 bytes
font_01_sfnt_off0000fd71.bin
738622c13e768a0115e7b05c7309e47e1b8426044f1a3809efe204361471cc0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 11884 bytes
font_02_sfnt_off00012528.bin
3d50f22d3ae6d9a4461c814f81554cc573a3512c555c2f223aedeeaca19cd658
pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 16080 bytes