Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f06a8f3d620a7bf…

MALICIOUS

PDF

79.7 KB Created: 2021-03-17 21:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e724791ba9518d34fba573378c48c068 SHA-1: a08f08c958c846bba16658926f81b7e1c80e7767 SHA-256: 9f06a8f3d620a7bf338a97ca219ebcaf753b1d86ecb4460718d25d1f59e0eeb8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/wix?keyword=ffxiv+ninja+rotation+guide
    • https://static.s123-cdn-static.com/uploads/4480142/normal_5ff20dd703695.pdf
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/e6d8c151b.pdf
    • http://aov.one/apostrophes_worksheet_for_grade_4d3faw.pdf
    • http://makedctl.site/28762023619p92g1.pdf
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/tomipimiput_rixiw.pdf
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5fef1b94e6e57.pdf
    • http://stroymarketmetal.ru/open_mind_beginner_a1ekiaq.pdf
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/7550523.pdf
    • http://montana-media.com/bleacher_report_nba_draft_showy0cah.pdf
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/jebitesuw_pezigaz.pdf
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fdc72aa3d7d8.pdf
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/wuwuxugoxera-vemobif-nufowiluk-kudelo.pdf
    • http://lifeeuro.info/oral_b_white_pro_1000_vs_sonicare_4100xkhjm.pdf
    • https://cdn-cms.f-static.net/uploads/4418583/normal_603cf46591cae.pdf
    • http://all-host.site/xixoradajokidedesazitwyko.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/8763966.pdf
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/sobonexog.pdf
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/862262.pdf
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fcc287fbb694.pdf
    • http://legiontry.online/showtime_rotisserie_cooking_guideswkbx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_c8f45cf252ad4e339df4e898e1f3790e.pdf?index=true
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_b58c675d02cf4688bde3325bee02cc21.pdf?index=true
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_341fcfb4f4b44030ab8125a5aba3f54d.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_e464acd5e20f48629d56cbf15425bd81.pdf?index=true
    • 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_off0000fc21.bin
01535bc3b9764edd0f4b827043837ce8f314f7f96710427343ff956b2c87c1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 5024 bytes
font_01_sfnt_off00010d5b.bin
0155b96b7c089b7b9e5d174f7690dd4a65906cb0fb64caa1e024ef503a5dc55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10828 bytes

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