Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b4f2f8af493012…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 14:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f782d442a1d2ef0d25548283b4445779 SHA-1: 0456fdd6df58f47758a63e8298f5b77ba3a4a2d1 SHA-256: 25b4f2f8af493012302b7b24a97c528021656010c41ae0ace122bde3a3b0f0d8
244 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or SEO spamming tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential phishing or malware distribution vector. While no scripts were extracted, the overall structure and URL patterns strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wb?keyword=foreign%20letter%20of%20credit%20format In PDF document text
    • http://nepatokada.mypressonline.com/tuludidunejuj.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/2334229.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/sepetarodubupuvi.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/lipokufojijeguzibifiwa.pdfIn PDF document text
    • https://guwakeba.weebly.com/uploads/1/3/4/5/134597639/d316904.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/25639636658.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/how_long_do_tracfone_minutes_last.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/rifaxafo.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/6172370.pdfIn PDF document text
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/mokunuxikevaniwu.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/5192df3671368d9.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/dopezumenabukap.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/gixonujamole.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/pogubod.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/6434395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9706d85c-9df2-475a-aa40-1375b396047c/how_to_help_auditory_processing_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2067110c-d130-4db9-a663-27d660a38738/naguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43145983-3ee2-4d53-8eea-5393f5b75213/saluseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32ef47c-81f1-434e-b513-3423177083bc/ruwijisenitajaviged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57ad1df-0489-4b18-9c76-8ea002658461/is_trauma_a_disability.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/20360963849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af002c5-1ed8-4d6b-a5f8-1aac61d6ac00/how_to_make_distilled_water_at_home_for_cpap.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/25524382802.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/jezilomixesojetuzutukum.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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5120 bytes
SHA-256: 6420eb927e87ff2f3d560a1a98cee145208a42298c48b7e159075c0575ca1050
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10284 bytes
SHA-256: b4418e222fc462acbf91b102e3bc8007e4bf2e0b49318e10ccd25eb7df9b4616

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