Malicious PDF — malware analysis report

Static analysis result for SHA-256 347944014e160fa7…

MALICIOUS

PDF

74.6 KB Created: 2021-01-21 23:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc462920c3ed719f1fe654dbfc2cdeba SHA-1: 51b28c1570d900815a6a8bcc159529c43c1377df SHA-256: 347944014e160fa76ffe296a83d0a358ef421dd3c5e1fdd1cc0f72d6a6c4b35a
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ML classifiers and ClamAV. The 'SE_CLICKFIX' heuristic indicates it employs social engineering by instructing the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. The document contains numerous URLs, with a primary suspicious URL being https://traffnew.ru/123?utm_term=unexpected+store+exception+bsod, suggesting it acts as a downloader or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://traffnew.ru/123?utm_term=unexpected+store+exception+bsod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fdbb40947ab7.pdfIn PDF document text
    • https://site-1166655.mozfiles.com/files/1166655/334520974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc78e409b8a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fcbe68b9c20b.pdfIn PDF document text
    • http://depofukug.iblogger.org/wudemalumijogatisetawamab.pdfIn PDF document text
    • https://losuwigawoje.weebly.com/uploads/1/3/5/3/135304717/7483973.pdfIn PDF document text
    • https://site-1178347.mozfiles.com/files/1178347/cake_mania_game_free_download_for_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_6003553d988c3.pdfIn PDF document text
    • https://site-1211821.mozfiles.com/files/1211821/tevesixama.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/zusulex.pdfIn PDF document text
    • https://site-1176655.mozfiles.com/files/1176655/zoxoliloxuwop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebipukavore.epizy.com/bsf_apply_online_application_form.pdfIn PDF document text
    • http://mubadel.epizy.com/454172550.pdfIn PDF document text
    • http://rubabup.epizy.com/score_sheet_beach_volleyball.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/how_is_reliability_reported_in_research_articles.pdfIn PDF document text
    • http://bavidoripo.epizy.com/ambala_video_song.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_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 5024 bytes
SHA-256: bc742963e701b4505ecaffa9fc98cd58539a0c676ced5aa042e2e991f21fdabe
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10088 bytes
SHA-256: 1022d46b62890e30b4b1819030f8984d9d5ed6095e50408262c322140c70e70f

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