Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df4fa2582a1344…

MALICIOUS

PDF

71.0 KB Created: 2021-03-02 19:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21fda64d4c51f31f95717c006c3f1895 SHA-1: 7269b6b41c4fb2b8a8b310204957c9669286c45f SHA-256: 28df4fa2582a13443a3d597dbf2e7c26a457da90031cb76bcfe81ddb10ae8554
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=intj+guide+to+dating In PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/4fba74116b53.pdfIn PDF document text
    • http://jotupati.22web.org/beatles_hey_jude_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_603827b5999a7.pdfIn PDF document text
    • https://jetizapu.weebly.com/uploads/1/3/4/3/134371104/rirumoj.pdfIn PDF document text
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/bacb02b7fecf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://virefixifefuke.epizy.com/thompson_crafting_and_executing_strategy_22e_test_bank.pdfIn PDF document text
    • http://wawukekaxemiju.epizy.com/48601701192.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/cinema_4d_materials_pack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/mupifajufitadiparukozuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/first_solar_series_4_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/zibukevano.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/academic_calendar_2019_ssa_assam.pdfIn PDF document text
    • http://mejizemobimoli.epizy.com/wrong_turn_2018_new_movie.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 4700 bytes
SHA-256: e35cd557d12408c194996a76b21add2fbcd5d676a33bd77dc9e1abc5f5a7e9f1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10064 bytes
SHA-256: 53a06e468ac71746214ba278737f53ce71c120c8b0b7a9113e8cd0611caf6898

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