Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1085d8babea652…

MALICIOUS

PDF

110.4 KB Created: 2021-03-20 15:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65f887362600d0452f63008fe975b0d4 SHA-1: 34504052e572bc2ea00562ad228479422ad038ea SHA-256: 2a1085d8babea652914f3ae800e5b57accb06a0eab403207000cddf34afa5bce
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 high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://zajinet.ru/aws?utm_term=lenovo+t420+upgrades PDF link annotation
    • http://pazolozul.mypressonline.com/54528177167.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/7179342.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/babunuwez.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/business_process_improvement_harrington.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/96654842738.pdfIn PDF document text
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/sesivumenu.pdfIn PDF document text
    • http://tamakar.xyz/jajewapesiwuwujozotusibdv8l5.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/af6a47659890.pdfIn PDF document text
    • http://stopnutristrike.ru/68546389611f3r6x.pdfIn PDF document text
    • http://lbaranaydin.com/29414031635vr118.pdfIn PDF document text
    • http://usacreditcheck.info/mandated_reporter_hotline_pennsylvaniancas1.pdfIn PDF document text
    • https://xuguxoxarakijob.weebly.com/uploads/1/3/2/7/132740494/navup_rolavopapipeg_mojuwuguvokem_zusawebepik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulevewutowa.epizy.com/4359645818.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/rirowuxaderagoripurorugat.pdfIn PDF document text
    • http://kirotomi.epizy.com/adarsha_hindu_hotel_ebook.pdfIn PDF document text
    • http://gulesovel.epizy.com/2888720555.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/what_is_the_basic_plot_of_a_streetcar_named_desire.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/97332299638.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/31354175925.pdfIn PDF document text
    • http://sitesiku.rf.gd/softperfect_network_scanner_android.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_off00017046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17046 5460 bytes
SHA-256: e4ea5d1eae85547ca1dec57fbb5a1464fa360a0f571670ae5f073a851a950452
font_01_sfnt_off000182fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FA 11956 bytes
SHA-256: 5a4a1c150fe908b2b8c00e65719eba043680053509cd40475bd8cf48082a91f5

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