Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa313eddd13dcd47…

MALICIOUS

PDF

83.1 KB Created: 2021-03-13 18:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a57e3c99db899556383fba12ae0c20c SHA-1: d0d0438d44f21fcff984baa973155baa644a10f8 SHA-256: aa313eddd13dcd47ff40e9720f366986db48abd52e5bddd0b02165863034c9f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to external URLs, one of which is embedded in the document body. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt, likely using a lure related to book summaries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=when+genius+failed+summary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470982/normal_600b02f482ab3.pdfIn PDF document text
    • http://student-yurist.ru/14327147178ap1de.pdfIn PDF document text
    • http://excschool.ru/kexadupimolofolarad0sngo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601db69c01b49.pdfIn PDF document text
    • http://alcozerox.com/90180117813dovgs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603e63e2ca406.pdfIn PDF document text
    • http://shopmzm.site/1746551869ft7iq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365545/normal_5fce25584ced2.pdfIn PDF document text
    • http://avtovishki-msk.ru/mevagivisesirodutokt4ko4.pdfIn PDF document text
    • http://gonugotez.22web.org/73810720853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_602abc2cd7d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f52f7badf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5fc83c930ec7e.pdfIn PDF document text
    • http://ductsunlimitedins.com/theories_of_motivation_in_education0okcb.pdfIn PDF document text
    • http://mediaverifiedbadge.com/physiology_by_ak_jainowtij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomirunorejuso.epizy.com/84539120248.pdfIn PDF document text
    • http://rirafibokiraj.rf.gd/how_to_turn_on_street_view_on_google_maps.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/consumer_reports_digital_subscription_coupon.pdfIn PDF document text
    • http://wekiputozuda.epizy.com/fofaregaz.pdfIn PDF document text
    • http://bufivuz.rf.gd/69457449061.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 6548 bytes
SHA-256: b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 5568 bytes
SHA-256: 06a3b9ad0cdb800ae76659b9e15a07e6d3d53a80dc8d5dc0277ccb8a9de5120f
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 11240 bytes
SHA-256: ddf08c68049a44ffadb0f519ecfcae19ce9f97e611919a79f3f5850860b1b6d4

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