Malicious PDF — malware analysis report

Static analysis result for SHA-256 b394e845fb6c0d25…

MALICIOUS

PDF

98.3 KB Created: 2021-04-30 10:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 99a090051331383cbcb8c8021a1e1a5f SHA-1: e96a21aca6e7b566cedaa185a2ea2e6bb0986dbd SHA-256: b394e845fb6c0d25a0b5346abbfcc140c718f398280c6549f1fc2bf946a4bc35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or subdomains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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/strik?utm_term=who+are+the+main+characters+in+the+house+on+mango+street PDF link annotation
    • http://gebuhrenfrei-mein.com/real_love_test_calculatoroclfi.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/naxidon.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/2867074.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/rezave.pdfIn PDF document text
    • http://copyrightsupport-ig.com/82537263752k2454.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/vajulasusalidareg.pdfIn PDF document text
    • https://simujoxeripo.weebly.com/uploads/1/3/4/8/134846432/relujilirekivodemu.pdfIn PDF document text
    • http://zahlungsservice-ch.site/nike_icon_clash_packable_jacketepssc.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/dilap_xewizuvamuxase.pdfIn PDF document text
    • http://natorg.fun/new_ariens_snowblower_leaking_oil257bx.pdfIn PDF document text
    • http://libertinemodels.com/dafobepaparijixedirokub473wj.pdfIn PDF document text
    • http://vinnipoh.fun/how_many_bases_does_us_have_in_germanyjefki.pdfIn PDF document text
    • http://trixy-matrix.space/duzojifolugibu7s38.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/9863039.pdfIn PDF document text
    • http://recepty-dd.info/dell_optiplex_9020_spec_sheetk4o8a.pdfIn PDF document text
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/kadiwavenivozo_notutiso.pdfIn PDF document text
    • http://afracheat7.xyz/what_food_do_gamers_eatrycq8.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/mafevovigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bugutaj/dufiximadipamuvutivi.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/play_roblox_games_for_free_no.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/verizon_actiontec_mi424wr_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/cunto_es_5_4_pies_en_metros.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/year_2_maths_column_addition_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/xogunevowobasuwovexidejam.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/32435205083.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 5076 bytes
SHA-256: 8a3b32ac743fe1f705675dfc4388be534b0a0be8f0cd75b2d05743ac69c90437
font_01_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10296 bytes
SHA-256: 2b39e7ac7c78153c2ff28b5b5b82da6ff6b337370408c3ba44a50bc61b9db20f
font_02_sfnt_off0001571e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00016c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361