Malicious PDF — malware analysis report

Static analysis result for SHA-256 96281ad1843fb518…

MALICIOUS

PDF

127.6 KB Created: 2021-06-11 05:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fab8828447cd41d129e8fe5a0f25b7 SHA-1: e0adae20dc3686901fb3252e4e95d2b3796b6279 SHA-256: 96281ad1843fb518805828f0101e15aa8b1e4f13e2e16de8cb6b20c27a3290d7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution attempt. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the heuristic firings strongly indicate malicious intent through the use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/pbw?utm_term=ratib+al+haddad+doc
    • https://polupamenutotuk.weebly.com/uploads/1/3/5/3/135334754/fikewipefun-ruxaxatifuk-winuganup-wefidoje.pdf
    • https://sutulozutujak.weebly.com/uploads/1/3/4/8/134884412/2041788.pdf
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/dfafad2b5cc0.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_60248d778ca97.pdf
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fff79ff7a9e4.pdf
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fd23853ddf00.pdf
    • https://cdn-cms.f-static.net/uploads/4478387/normal_606e24b92421c.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fe6e2ba2ba53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xorunezagu.pbworks.com/w/file/fetch/144656928/why_is_gluconeogenesis_necessary.pdf
    • http://jopamedet.pbworks.com/w/file/fetch/144698976/55073275402.pdf
    • https://uploads.strikinglycdn.com/files/51c81bef-d025-4ef5-ba92-285e44f696c8/what_is_cutover_plan_in_oracle.pdf
    • http://ruwomodanom.pbworks.com/f/infiniti_g35_coupe_for_sale_near_me.pdf
    • https://uploads.strikinglycdn.com/files/bd10e378-abc6-483a-8775-d569f0531e8c/64874608714.pdf
    • https://uploads.strikinglycdn.com/files/d6dcaabf-4080-479b-a38f-3ee7110c086c/here_richard_mcguire.pdf
    • http://kefimazusob.pbworks.com/w/file/fetch/144424968/diferencia_de_contabilidad_administrativa_financiera_y_fiscal.pdf
    • http://pugaxigodaka.pbworks.com/f/gems_simulator_and_guide_for_brawl_stars_indir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001baa8.bin
bdf86bdc78af34a4d668e58926a695f50b9810c405866b1f8c6cf5237ec45cb6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BAA8 30744 bytes
font_00_sfnt_off00017273.bin
9f460a520ec537040d08c24c6b82180cfd389cbd8bd67593527fc0236e909475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17273 4900 bytes
font_01_sfnt_off000182da.bin
b3018c04c4520583d0b3fd846815a5d0ccbad4b259201ae064e9d86d9e75c898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182DA 6348 bytes
font_02_sfnt_off00019248.bin
ace54a690b961a803550541c117fb997720b54b01a6e8f0f17b1528dae160455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19248 11884 bytes

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