Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c22f7d3c3435b8c…

MALICIOUS

PDF

85.8 KB Created: 2021-02-25 17:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 12225676c30ec4a8530faa27c5169230 SHA-1: f42ab23e971e7af21221ba116d70e9b912a68c5e SHA-256: 1c22f7d3c3435b8c086d926ebdced5d513d533e399392da75d35d4d2a9e5078e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded links suggests an attempt to lure the user to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/strik?utm_term=unbearable+lightness+of+being+movie In PDF document text
    • http://zikapipumimapo.22web.org/midland_75-822_antenna_connector.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/norapewojojak-sibik.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/2787e7cc0e.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/derukewude_rirusevove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_601e20b5801f1.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/mazaxufepam.pdfIn PDF document text
    • http://wavarev.22web.org/film_bikeman_2019.pdfIn PDF document text
    • http://leduxebawini.22web.org/88716869819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_60039fd9c9bdd.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/grover_washington_jr_winelight_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/3ZUhigY/4611699771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalowakudedakov.rf.gd/2019_bmw_330xi_owners_manual.pdfIn PDF document text
    • http://nepumunu.rf.gd/gonalevaludemexakosigobes.pdfIn PDF document text
    • http://tadipakajare.rf.gd/how_do_constructive_plate_boundaries_move.pdfIn PDF document text
    • http://dadogabipot.rf.gd/bending_moment_in_a_beam_lab_report.pdfIn PDF document text
    • http://pupisovid.epizy.com/mexixifiwedige.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_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 5372 bytes
SHA-256: 6cdd6ea0bbcfe914c8666d9f27ff933cc06ba53dc496d7b8602c494cad501d61
font_01_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 11192 bytes
SHA-256: 7d64aaea113aad40e1bedadb070f6192273690d43022ea0da91103fb813119c9

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