Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c12b6f7a3dec17e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 08:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3fada08bf7b67e7f6fbec30d0e43f49 SHA-1: bcd8b62b0b46ed9190ddd9824ea2363259a422e0 SHA-256: 4c12b6f7a3dec17ea9d498b6756b0d0ef02e15e4c8b33627897963d399dc005d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+to+display+json+data+in+recyclerview+in+android PDF link annotation
    • http://fikakutipid.mygamesonline.org/bruchrechnen_aufgaben_mit_lsungen_klasse_7.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/pigugavodegotudoxigaj.pdfIn PDF document text
    • http://republvinb.fun/61591146599a90ub.pdfIn PDF document text
    • http://evatopshop.xyz/16371539142w79q6.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/gKVqHhi/98883572991.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/4iiG7z8/23805833746.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/sib3n4w/kiguwebagos.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/jcvT3iV/79263291149.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/h2hgieN/67045906020.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/5agessI/best_story_podcast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/10cf641d-3373-485f-864b-9afe47f01284/zebizesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253c54a7-ae84-4edd-840d-712895acea20/what_are_the_best_exercises_for_golfers_elbow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7e90dc-8527-413d-9d34-d3727e144039/corporate_finance_internships_chicago.pdfIn PDF document text
    • http://giraxajo.epizy.com/67285889493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1190795-1f7c-4d37-9ce2-39377663eab3/dd-wrt_wifi_extender_same_ssid.pdfIn PDF document text
    • http://zogemidagubaro.epizy.com/xipabomugek.pdfIn PDF document text
    • http://tudafaketewud.rf.gd/simples_nacional_tabela_2020.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/11083293876.pdfIn PDF document text
    • http://bajivuselome.epizy.com/descargar_avast_antivirus_android_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 5144 bytes
SHA-256: 9d372fe32d1a56fd02d0f93cf6791b9661463a24ca5370338b3b1ce09c034de5
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 11072 bytes
SHA-256: 84135589e9c7456b3ee0a6d8014eb6ed8a5f044a66a3c57c4287feeaad6eb197
font_02_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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