Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7e811966e14a88…

MALICIOUS

PDF

72.0 KB Created: 2021-03-18 16:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 86d01c4849681753cd9459e15e24bd86 SHA-1: ebbe174a136bccca48492e0a9621b979081c3814 SHA-256: 3f7e811966e14a88a8c96c2f7027ae803eca66c084380e94b78d456504a3e224
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/123?utm_term=cartoon+face+3d+model+free PDF link annotation
    • http://orbitan.fun/most_aggressive_badgerrrbgx.pdfIn PDF document text
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/vukupukelus.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/cghbigL/first_words_for_toddlers_and_baby.pdfIn PDF document text
    • http://glasshookahcatering.com/reddy_heater_35_spark_plug8c71n.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/bahhmih/32113641950.pdfIn PDF document text
    • http://huaweistoreukr.xyz/19687215496jln55.pdfIn PDF document text
    • http://mosquito.codes/who_is_mandalorians_fatherq16i3.pdfIn PDF document text
    • https://lusixepapage.weebly.com/uploads/1/3/4/6/134605241/sokefixubilejozowi.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/8096986.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/toxulatifogipol.pdfIn PDF document text
    • http://cardioactiveufficiale.site/jefemazitowupiboretxx527.pdfIn PDF document text
    • http://reflectionss.space/financial_reporting_financial_statement_analysis_and_valuation_8th_edition_freepnu11.pdfIn PDF document text
    • https://sulewonabesonu.weebly.com/uploads/1/3/2/6/132682327/745046.pdfIn PDF document text
    • https://cdn.sqhk.co/zepaginu/RMjiijc/jenulukaxutexetumed.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/4c2026.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/pimeloze-lulinobawija-wonopanukutin-rotesaliwiz.pdfIn PDF document text
    • https://jokesekarizav.weebly.com/uploads/1/3/1/4/131407558/nubojuxuxenotawovo.pdfIn PDF document text
    • http://goldenframecollision.com/ruwitagejaztknu.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/7CZRni4/used_fold_up_treadmills_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/iialjeO/kingroot_android_apkpure.pdfIn PDF document text
    • http://idealica-tufficiale.website/whirlpool_duet_f_errorjxfr9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_fbb11971dcf147b8984a56b2f85d6e5c.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_76836eff95394bf29ef6d1bb57964b15.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_4b41e59dedc5463e86d9ab6698813a94.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_f669200f5dde4b59a4467b2296b82990.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_3e587251f4434ea7a42c8a1f3bc8a914.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 5056 bytes
SHA-256: 112aa68e2bf6b804cccfa36380021dee23cd02b3efcb1285bcf3b4a8e0500ccf
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 9648 bytes
SHA-256: ccce6497037a44a31315ac7ebf86e1d17c96dcecc5950eacb7a8cf6d996b3bfc