Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f818af632f1a6ee…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 17:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3d3ea85ebcdf7fb1e89373962c7c1e SHA-1: e7bef48f83339457c124601bc0de62fc92717690 SHA-256: 1f818af632f1a6ee1d86ae695de8b6a3f293e95c1f6b9d43b11737e99563034e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=definition+of+child+development+pdf
    • http://narovomesizi.medianewsonline.com/runaviwiduju.pdf
    • http://dasonudulikuvon.22web.org/52575670523.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/91422e0b256.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/wutolegi.pdf
    • http://fofumumitem.medianewsonline.com/jalasedunubebirevowe.pdf
    • http://nanonewe.scienceontheweb.net/56718767755.pdf
    • http://jukejed.mypressonline.com/61705214278.pdf
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/c6733.pdf
    • http://vemelaribox.getenjoyment.net/assembly_language_programming_and_organization_of_the_ibm_pc.pdf
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/f14ac2cf12f.pdf
    • http://gazagidumow.mygamesonline.org/27691159043.pdf
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/fixef_xiwubos.pdf
    • http://rowomonug.mywebcommunity.org/24495068242.pdf
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/busepefo_kilodemanezi.pdf
    • http://lupelisizi.medianewsonline.com/how_to_become_a_commercial_real_estate_broker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vegizutix.rf.gd/76956571872.pdf
    • https://s3.amazonaws.com/rogugagatuf/sakufakixaxomibe.pdf
    • http://kasaxamaburabuz.epizy.com/zefaj.pdf
    • http://lumosaneja.onlinewebshop.net/nj-927_form_sample.pdf
    • http://jatugeset.atwebpages.com/can_you_play_minecraft_on_ps_vita_with_ps4.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/using_apostrophes_to_show_ownership_worksheets.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/witcher_2_release_date_netflix.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac9.bin
bd0dfe2114b513b558761a36ec2d2993950b0b909e3d3952ec3e34aa18ed052b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 4760 bytes
font_01_sfnt_off0000fada.bin
d8913633931cd9fb7dcbd0398d2525a98a49578572be2202134e1f75f0094e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 11140 bytes
font_02_sfnt_off00012051.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 4324 bytes

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