Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682958a54503fe5…

MALICIOUS

PDF

73.4 KB Created: 2021-03-02 02:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f4230d24ea7a5e0890122a224bfa1ac0 SHA-1: 28193a3b78bc18c4f549011bd7c37f57c9b99ad1 SHA-256: b682958a54503fe536cc8eb36b4b3c53cae4de8d30c5015c8cdf44f80b1211ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are part of a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to text messages, likely to entice users to click on the malicious links. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

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://soxebez.ru/award?keyword=what+are+the+different+types+of+text+messages PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/Wiaw5gc/7814251773.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/1TUjetr/vapefobaxibeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450148/normal_5ffb40bf3cf5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5feaec33abd93.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/eUdiehf/papa_s_pizzeria_to_go_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_601de9dc79842.pdfIn PDF document text
    • http://workmonster.net/english_speaking_class_12dt4qh.pdfIn PDF document text
    • http://opensoda.pro/45289196281kb0ti.pdfIn PDF document text
    • http://artrosil.xyz/awdhesh_premi_ke_bhojpuri_gana_djpv929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_600f9d1ee6c3b.pdfIn PDF document text
    • http://idealicaitalia-official.site/tratamiento_leucemias_agudas4gqty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zolibexusago.epizy.com/snark_tuners_review.pdfIn PDF document text
    • http://juvumutat.rf.gd/discerning_the_voice_of_god_priscilla_shirer_workbook.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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5604 bytes
SHA-256: a3e77580d9ef683c0ac7fe47bf84a00f7993e715f2c9c52d0cb1da1e9ef86cb7
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10144 bytes
SHA-256: 7839fc1e0908fde661ed898dd34fb9f4898de0624f209740788fa03fc275158a

Open this report in the interactive analyzer, or submit your own file for analysis.