Malicious PDF — malware analysis report

Static analysis result for SHA-256 72df3b4f6326b27f…

MALICIOUS

PDF

113.8 KB Created: 2021-03-17 13:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ecffc92e307b65c8d0ff6fc80167e567 SHA-1: 1eee14d01ecc804d527d29df451d2c489103c1e4 SHA-256: 72df3b4f6326b27f9e36e9d5d2e7e6abec29fa1e29cf5f28b1aee15ed025c192
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to 'Bibliography format for citing internet sources'. The presence of numerous external URIs, particularly the one pointing to 'fokemale.ru', strongly suggests this PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL findings are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://fokemale.ru/123?utm_term=bibliography+format+for+citing+internet+sources PDF link annotation
    • http://chambrely.xyz/474230162235evh4.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/uBjjLEN/1057978974.pdfIn PDF document text
    • http://netewe9.xyz/borderlands_3_cross_platform_savesv9t6e.pdfIn PDF document text
    • https://kesetemokeze.weebly.com/uploads/1/3/2/6/132682820/5787824.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/padixolazuvele.pdfIn PDF document text
    • https://cdn.sqhk.co/xalurubizud/fKjbWgf/pogamo.pdfIn PDF document text
    • https://zisumujabi.weebly.com/uploads/1/3/5/3/135315444/pigofonubojiju.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/what_is_a_push_notifications_android.pdfIn PDF document text
    • http://c-advance.space/bollywood_song_mr_jattot9su.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/73633268-f952-444d-863e-0b78b499ecf5/tunow.pdfIn PDF document text
    • http://tuwelifijija.rf.gd/85290965173.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/figajow.pdfIn PDF document text
    • http://nokolul.epizy.com/angularjs_html_template.pdfIn PDF document text
    • http://bilunijo.epizy.com/vefodutib.pdfIn PDF document text
    • http://dafesofuxub.rf.gd/50566942334.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/tobujobalew.pdfIn PDF document text
    • http://wekisuxizo.epizy.com/64495499928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f50d5c-0a2f-4593-bf92-d57c144e4ea0/nora_roberts_the_one_trilogy_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b344476-7853-4ba3-8d7e-4af67a4f2ba2/44504134418.pdfIn PDF document text
    • http://somepezepu.epizy.com/zufav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF4 5600 bytes
SHA-256: e6d33d0916f2fd9b9dd2021c3bbe0edf1e616514df86a588ede1bf66b8470cdd
font_01_sfnt_off00016ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDB 11752 bytes
SHA-256: 1a2b55ab1f788fa1add912db08bd357ee2663f24cf8bee6e18471271d82812d6
font_02_sfnt_off00019600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19600 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0001ab2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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