Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a6e778a8847c51…

MALICIOUS

PDF

155.7 KB Created: 2021-03-30 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b65c847ce0fc9e17278ef9635221ba5 SHA-1: 32b5a0032f50febcbb040c0a21a9f8ea0cfae095 SHA-256: 37a6e778a8847c51f89f75af009b7af25fd58d6f23cf74cb1230fe4f49e457b1
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with high confidence. The presence of a 'download button' lure and the overall structure suggest an attempt to trick the user into navigating to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=chem+1211+lab+manual+answers+ksu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fd2813bcf973.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/my_name_is_red_author_crossword_clue.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/ways_of_avoiding_plagiarism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389365/normal_60083014df0e8.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/26942663207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6050ef34901a4.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/business_translation.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/social_psychology_myers_free.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/assessing_and_evaluating_student_learning.pdfIn PDF document text
    • http://faromobipon.22web.org/37241518550.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/calculus_2_kenyatta_university.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/yaesu_ft-450d_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9eb852b27f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2c4523-e095-4a3a-87e2-6b64393c0835/19549022726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3d4c9f-dfef-4be0-a4a9-4051c1448519/degir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69d0675-fece-461a-905f-b8a5d2f8c356/15013592389.pdfIn PDF document text
    • http://lerariwafibot.epizy.com/bidonamobifafew.pdfIn PDF document text
    • http://xugivazule.rf.gd/xogulelumujazamuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2174E 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00022190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22190 5312 bytes
SHA-256: 12cf1426d7c974637822bcc5d87de6a15dd22a41d17eefaeb3db57483b7830c0
font_02_sfnt_off00023382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23382 13744 bytes
SHA-256: 0cfd41a8a41fbca07816dc8324d229a146133ab1bd2e2a12817a1fce989ff85c

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