Malicious PDF — malware analysis report

Static analysis result for SHA-256 521577b3af0c3c0b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-12 03:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d278e1f120ebf1805c6966d30c8017f3 SHA-1: d1ec2dc84d4fce6fede18ecc17aaafaf8feec9a7 SHA-256: 521577b3af0c3c0b3e6ee11a174c965540cefb64de0fa4f8759bc5a56d487f53
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL `https://baarspo.ru/strik?utm_term=windows+batch+script+for+loop+continue` suggests a lure related to programming or technical content to entice users to click. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', which are tools that can be used to generate PDFs, and the presence of external URIs points towards an attempt to redirect the user to a malicious site.

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://baarspo.ru/strik?utm_term=windows+batch+script+for+loop+continue PDF link annotation
    • http://lemafesopeposuz.mywebcommunity.org/new_catholic_encyclopedia_vol_13.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/wusimedili.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/free_nkjv_bible_download_for_pc_windows_7.pdfIn PDF document text
    • http://funiwigurogamu.iblogger.org/76621765616.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/20295852236.pdfIn PDF document text
    • http://toluvubub.mygamesonline.org/venavomaxumiwoporajuxip.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/attachment_theory_adults.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/netgear_wnr2000_setup_as_switch.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/cec13ff0-ead9-4afe-8a19-9c24b4a67e96/physics_formulas_mcat.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/62326278204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6550572-bfe8-4446-a96c-c8650bd9af0f/gtx_1650_vs_gtx_970_sli.pdfIn PDF document text
    • http://robeguf.epizy.com/xofujujixapalax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3537bb26-f2d0-4811-8b85-013f472f4fd9/feos__cog__fes__co2g_h__x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3569086-0ce3-42e7-93a3-59dffc5b18c9/82635247284.pdfIn PDF document text
    • http://reratosagozi.rf.gd/mepedunes.pdfIn PDF document text
    • http://jufosijapoxavof.rf.gd/aprender_a_escribir_el_abecedario_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecd237d-fed6-45ad-90dc-14cfc8156077/22197054074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95ddc3b-afa7-4a52-b37e-766aba2af9dc/books_like_jojo_moyes_me_before_you.pdfIn PDF document text
    • http://kagurajujit.rf.gd/venuxosuzegutugeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4186518b-5097-4d09-99fe-371aa8279ae0/what_if_god_was_one_of_us_lyrics_alanis_morissette.pdfIn PDF document text
    • http://wogurep.epizy.com/metal_bending_machine_project_report.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5488 bytes
SHA-256: 31b13f0e3af42150c988d6f4911e572521e309130cb4ff750ccc14b3484c38b6
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 11556 bytes
SHA-256: 25ff30cbb57019aecd2620ef7bfb37488427e85b55982abc24d1e0bbe89cc618

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