Malicious PDF — malware analysis report

Static analysis result for SHA-256 88283155c606952f…

MALICIOUS

PDF

85.6 KB Created: 2021-02-18 23:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7a2ec7ad33a6f934056c9c8088ba2736 SHA-1: d096f652bd54cc43948aaabd3a0c2203bf01cfa4 SHA-256: 88283155c606952f89c155bf97b53f0f1be6d14137a9c50a894143eae9b85d67
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links point to various PDF files hosted on disposable domains and cloud storage, suggesting a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the structure and numerous external URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=shakespeare+sonnet+73+interpretation+deutsch PDF link annotation
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/e1bec.pdfIn PDF document text
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/kalalezadim-gebojuzirevu-terabawakine-bonadofuk.pdfIn PDF document text
    • http://prizinsta24.space/how_to_reverse_single_crochet_left_handed6s4a3.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/janiwiwudazemefema.pdfIn PDF document text
    • https://xonufukagupunim.weebly.com/uploads/1/3/1/3/131384400/0176ea7b4fdae.pdfIn PDF document text
    • http://citrus-fruit.space/wedding_invites_templates_freerck45.pdfIn PDF document text
    • https://nofojivebot.weebly.com/uploads/1/3/2/7/132740499/jatarugozunabas.pdfIn PDF document text
    • http://chaptejvxz.fun/gikerabesakzh6q.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/radujigipa.pdfIn PDF document text
    • http://sedouche.xyz/how_to_get_a_new_remote_for_apple_tvb138s.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/iihbge9/batug.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/modojofimoxewevep.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/1094737.pdfIn PDF document text
    • https://fixojifuxupelo.weebly.com/uploads/1/3/0/8/130814076/2ebeacd.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://s3.amazonaws.com/sakaburepagase/bojigatizuwezufat.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/megarevowiwirofukenubo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/wekifizag.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/38314452366.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_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 5420 bytes
SHA-256: 7f64059488d4374e09065353097fbf7a02f9af6ac22916a98a9371b9c0c81581
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 12284 bytes
SHA-256: 7a7f266fec1aa2a0bab25267621a4d744bc5ac47bf703bb65454b5a4f885a63f
font_02_sfnt_off00013b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B33 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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