Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f67a2cda3d3e9df…

MALICIOUS

PDF

78.3 KB Created: 2021-03-21 04:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ca89485b53645d56f923ae5bb6c1f7e4 SHA-1: c76839e994592c06f5a6bc902a87d08b826dea72 SHA-256: 8f67a2cda3d3e9dff363c671b8eb423da219e78ec0a17348923cac3486f23519
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=game+killer+latest+apk PDF link annotation
    • http://chuvashovfamily.ru/103650339950x11r.pdfIn PDF document text
    • http://speak4pro.com/mejetusukikegedenelatelopqopk.pdfIn PDF document text
    • http://chisto-chisto52.ru/48853096526jtgtx.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/jogudebimekuguzupivilud.pdfIn PDF document text
    • http://shoop-fm.ru/coloring_pages_christmas_light_bulbsegmok.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/how_long_does_it_take_to_be_a_marine_scout_sniper.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/gewuwipus.pdfIn PDF document text
    • http://constructionhouse.info/letebugavumetanukukubkt54e.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/kevoxekawex.pdfIn PDF document text
    • http://5gusevshop.space/viki_asian_tv_dramas_movies_apklo219.pdfIn PDF document text
    • http://4gusevshop.website/zazewebrde1u.pdfIn PDF document text
    • https://kexidenixerebez.weebly.com/uploads/1/3/4/4/134467946/7833130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xezonijida/kazapumigarar.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_80f8ac3f91104bbdb091bc423db42ca0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/70377982753.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_4ba6d7b2fd5c48b087dce0083f1aa319.pdf?index=trueIn PDF document text
    • http://noxukimu.myartsonline.com/symmetry_math_download.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_65de38a9aba54db48d9901f553b5f6b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/my_gas_fireplace_switch_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/it_money_world_marketing_affiliate_platform.pdfIn PDF document text
    • http://biwefejiza.myartsonline.com/50743682527.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5060 bytes
SHA-256: 8aee5ad462223f325a8b7ec67a74233d0153a9aefd638b148bce092aba54da9a
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 11132 bytes
SHA-256: 43e63632529820ddfb828c65fee0060db20e90376e202eb96ba9806ef7b19c4e

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