Malicious PDF — malware analysis report

Static analysis result for SHA-256 91914436cb50f138…

MALICIOUS

PDF

97.5 KB Created: 2021-02-25 00:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 547217e3d8cdd8cb59d1c953cf63a467 SHA-1: fe3255b94474e463a2b0775536e41dc52e662a25 SHA-256: 91914436cb50f1388bc52f19cd0a4b3360a307afb12aea59584cb6ba3df880b9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'act-67c-practice science test answer key', indicating a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV and ML detections, strongly indicates malicious intent, likely for phishing or malware distribution via the linked sites.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wix?keyword=act-67c-practice+science+test+answer+key PDF link annotation
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/5716310.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/1742658.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/jijfibX/adobe_photoshop_sketch_chromebook.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/ogg9gh2/63634772823.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/javebu.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/OjhOibh/colors_that_go_well_together_in_home_decorating.pdfIn PDF document text
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/2c5d355e.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/3gjijgd/the_light_park_houston_tx.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/nevidi.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/tikefom.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/kukojedijobokulubivowijek.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/cUghtjd/microsoft_azure_login_api.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/zapenil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/alteraciones_de_la_conciencia_psicologia.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/49468551269.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/titofamopabor.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/xasuwefikubumitodax.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_off000141f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F0 5408 bytes
SHA-256: 3185f184522e08023ae034e2fd5faf4dcd586d530253ec3a02f92c0c79bcbf23
font_01_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 10548 bytes
SHA-256: 2239f5c41cb4b8f021102167af2bbb1463a15dd3d5261d1a39393a69d32b9a14

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