Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc7d7370f6c9d77…

MALICIOUS

PDF

81.6 KB Created: 2021-03-06 23:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4db1e3b277f0f761b6a9e80666ab2007 SHA-1: 99d13620debf592b0559824824f46d6536067ceb SHA-256: 1dc7d7370f6c9d778e7c9e7228bad2e744f26ddc9f0541b88b033381cf8b91dc
194 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 0.9998

Heuristics 7

  • 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.
  • 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://bologen.ru/strik?utm_term=english+dictionary+app+iphone+free PDF link annotation
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/sofulekaxamebifafut.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/3689251.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/c18fe9d8bed19.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/gjghM6j/synonyms_of_good_politics.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hjidiiK/kukaxegozanumikoxuzupa.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/0978d2.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/egc5Qhc/teachers_pay_teachers_seller_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/redixebu/2unbXjj/16382661044.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/2893023.pdfIn PDF document text
    • https://gedikorewugeg.weebly.com/uploads/1/3/0/7/130775309/897183.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/iffbpih/13825859134.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/6b357a51f7eac1.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/suvojo.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/Bfecii9/29693929195.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/ggjjjjd/evertech_sandbox_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kupikobu.epizy.com/25001572877.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/57718147882.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/franchise_operations_manual_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/bars_and_melody_fast_car_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/37499069932.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_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 5476 bytes
SHA-256: 2f7e6b808191905121cb0b7fced325069f3543f6b282c5e8bbd7e134fbfe69a9
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10452 bytes
SHA-256: bc0137cc30627c365994db49857f93c65f391b30cb7bd1ff9b7550a61a5cfb12

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