Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6455f0b833779cd…

MALICIOUS

PDF

98.4 KB Created: 2021-05-27 06:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2ee339b5c58b765e18495c24d694c0e2 SHA-1: 22d20f68cb64541289ead855f3b122a32f2fc062 SHA-256: e6455f0b833779cdeff6c1cd767db97559f0e7c046cc9437dd1a0f5da0563462
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests an intent to interact with external resources. The primary function appears to be redirecting users to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=javascript+the+definitive+guide+7th+edition+ebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6056aa1408f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6024aefc10a07.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/bubapifewotozu.pdfIn PDF document text
    • https://zapedumukovig.weebly.com/uploads/1/3/0/7/130775012/37c99.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/93654bb3f2f7cd.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/getiteradiz_xaviramakitidi_bilalet.pdfIn PDF document text
    • https://kedixomavej.weebly.com/uploads/1/3/4/0/134017366/tutolinowiparex-nupototuvaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fc65c1c91f4b.pdfIn PDF document text
    • https://bapejezobo.weebly.com/uploads/1/3/7/5/137513383/lifenoful.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/17387601.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/nibodetetifovekol.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/e3281776edb51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fffbd7e93cd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fe3d7cc22fe4.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/3caf44.pdfIn PDF document text
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/52692baf0e.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/7737987.pdfIn PDF document text
    • https://rivelipa.weebly.com/uploads/1/3/5/3/135349188/madag.pdfIn PDF document text
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/lulixi-jozorasesif-nuzatitapu-gewideda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_606ea9484b203.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/5c6f3ba1-2ac7-406c-8a58-80d682f7ea98/44400552795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82e6677-d550-4925-8548-0aaf03b53ddc/vifigajibivedezavetidogez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55117dc4-8965-450a-901a-466852043ed3/22245649161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f2b5c6-b077-4710-85a1-b02d0ab6df69/mercruiser_4.3_v6_idle_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b9219-ea01-439a-8467-846da0c6843a/what_is_the_base_of_class_b_airspace_at_lakeview_30f_airport.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 5716 bytes
SHA-256: 04c80aa94a45ee808d7bddd492593da7adbb679bfa3c3f5263f8caa4694c93eb
font_01_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 3136 bytes
SHA-256: fd4f5f9fe99fa523368018808991773d94fc8bbb78547cc8e89de377e21f79e0
font_02_sfnt_off00013bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB4 12496 bytes
SHA-256: 539f7393130c32f21e5fe391194b0edbd78dde3ae71bfbfe442e6b5488bfe8d8
font_03_sfnt_off0001663b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663B 16064 bytes
SHA-256: f0f083194428ae24bb9ec42a4e1ff5b0d6cf87215180a1b4af466dc9842c6c3e