Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d3bba9ff7aa926…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 16:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5fecf84274a820486bfe6d69534c8c6 SHA-1: b8915110438c5268fc11a9b9d61db124de8b07fa SHA-256: d4d3bba9ff7aa92698daf4b7ca9ee490fb7a4c4a0a81f0cbc782e4c2cee5aa88
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=addition+and+subtraction+with+regrouping+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5fdb32e6c2089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487658/normal_5fee27d48fdf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_603446372fdfe.pdfIn PDF document text
    • https://jukewamozaf.weebly.com/uploads/1/3/1/4/131438013/516708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_60588a26e8996.pdfIn PDF document text
    • http://vuwavutos.iblogger.org/kedafexebir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_5fdf396128c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_601eddac040b2.pdfIn PDF document text
    • http://rukafijawidataw.iblogger.org/biochemistry_carbohydrates_notes.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/puritan_society_in_the_scarlet_letter.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/7b6024855.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/2423594.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/70972266640.pdfIn PDF document text
    • http://vebowulaze.22web.org/twilight_hindi_movie_full_hd_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6015a426a0d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_603cc1156fb7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fcf126c61957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60278c1071da1.pdfIn PDF document text
    • http://rapelubide.22web.org/when_to_use_with_in_sql.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawivemepogu.epizy.com/tokuw.pdfIn PDF document text
    • http://xatulebebulife.rf.gd/7551892851.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/81499310351.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/bidai_song_hd.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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 5672 bytes
SHA-256: c107c388552d60b88fb9a42888ddf0b70ede91ef32665d90fb39d4cc1b0f88fa
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10352 bytes
SHA-256: 0791b72e397aebcf055dbf669d2781b2453fe449ee0d1ae994d9c0e20a836592