Malicious PDF — malware analysis report

Static analysis result for SHA-256 af81524bbbf69aee…

MALICIOUS

PDF

88.9 KB Created: 2021-03-19 21:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 39051a60b20a3e377e1eb9e7753590c3 SHA-1: 4dbc8034f92073dcb8a443be4d388ab166e943b6 SHA-256: af81524bbbf69aeee75e15483a2193db8d90c3419956ceae0b4d5b8abf198a02
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://seumenha.ru/wix?keyword=sony+mp3+wma+aac+52wx4+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384142/normal_600077a4cefc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_604b7060cbd22.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/digejijilizebij-jafow-mamowafo.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/427582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_604e873fd442d.pdfIn PDF document text
    • https://nagudunegotup.weebly.com/uploads/1/3/2/6/132681409/xoripowevurewum.pdfIn PDF document text
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/monezubo.pdfIn PDF document text
    • http://axacheat4.xyz/what_is_nasdaq_100mbstz.pdfIn PDF document text
    • http://sendgrid-de.com/ledekagasobebavizetupc3lqj.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/15e5d62d9de85d.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/23439435647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_601e0c4b0a602.pdfIn PDF document text
    • http://aicberg.net/hedge_fund_market_wizards_how_winning_traders_win0zu9w.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://uploads.strikinglycdn.com/files/f043000e-de31-4e42-acf2-5e53b89ac599/air_force_1_black_history_month_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/how_to_increase_height_in_1_month.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/jumonawur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd75d9d-857a-485d-b255-153f65743e81/bisibinanopewitipiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/82615676562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5327f61-d963-4ad7-8bd0-636c2fcf4b79/jomimuguga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018448aa-7043-44e5-ac2c-835e03991a6d/the_tragedy_of_the_commons_summary_worksheet_answers.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/47585897793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0235f19-2030-4a58-9743-d72b30723af3/all_american_pressure_canner_921_in_stock.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011bec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BEC 23304 bytes
SHA-256: 8dd4cbf7e204a395fc33c933435e1d9833bcf9e7d3a78b1393243572f974e337
font_00_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5316 bytes
SHA-256: 7d8a715a83cf0d65d92fb1ebad999211b4cf36ae6733f3c24f184628d1df3a26
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 9932 bytes
SHA-256: cdc2b2b7fca59baf075cf4c87a0bfce8c3ed5d13cce2e3954a45184643e68b3a
font_03_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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