Malicious PDF — malware analysis report

Static analysis result for SHA-256 153560e55ae2486c…

MALICIOUS

PDF

116.1 KB Created: 2021-05-07 23:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1a3f236982e2cd141fa03e34b5891512 SHA-1: b0f0c910d6fe6f688d8654ae6878e0f141d7ef64 SHA-256: 153560e55ae2486c6884ee157a0777e50f51988a9722848962a742a7ca0de88e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The embedded URLs and the heuristic firings indicate a link farm designed to redirect users to potentially malicious sites. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jacksth.ru/strik?utm_term=romeo+and+juliet+test+review+quizlet PDF link annotation
    • http://vudasuti.mygamesonline.org/1779370744.pdfIn PDF document text
    • http://wixiziz.iblogger.org/xolozedelobovebexaloz.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/jhjfjfD/fire_and_glory_outpouring_youtube_live.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/hiTijie/police_bike_city_driving.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafovivejaza.epizy.com/quotation_template_uk_free.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_118206839f5f409caeab47d61d76ca12.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_8dc1ea68e8aa4ab9b6b494e75e21c9f5.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_2e48f7df26644571bc43e20ec7bec763.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe16fcc-1523-4268-b2bb-99f81c5be766/vexinagemikosoxulom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222f92f5-0fc7-4ec9-918e-a705bc611d36/fazifo.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/zomel.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_2f8d5904627d40278aa5fe65976264db.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_14e14a9d7a4c42579f548ef972cc30bf.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_37924d2c15db49a1a9cb6484a35648f1.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_2fb93276f5c847e6ad9be1756e39d4a1.pdf?index=trueIn 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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18672 5380 bytes
SHA-256: 7ecdd8a85df63bceff2d47bdfb3d2619db2ae3b60024012cb06899f42a75daae
font_01_sfnt_off000198c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C3 12104 bytes
SHA-256: 1ab378f1c21b0c576d5dcc6b4d394d9402ff921062a8768119fd50b72a3bec5a

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