Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bf0623288a1f2f…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 04:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cdd453501ad672046ca160761e597938 SHA-1: c29be522bec7f2f2c4f482bbc20701ddf3734c58 SHA-256: 23bf0623288a1f2ff51273704eb87bc8b80847630b19e992f7ff6df348d2efdf
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, including one pointing to 'bologen.ru/strik', suggesting a phishing or redirection attempt. The PDF structure also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=the+chronicles+of+narnia+the+silver+chair+filmymeet PDF link annotation
    • https://bosupazalo.weebly.com/uploads/1/3/4/4/134473359/vijilekewalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fcb6f70b27d4.pdfIn PDF document text
    • http://vemafenuxaj.22web.org/vabafosikiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_600b5d58a29f7.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/kifezafe_nigibaker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_5fef69c37d023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417818/normal_5ff96c3667f16.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/eGJgijg/vibekamogu.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/cohen_s_masterpiece_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_602f6fb730690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5feee10abc71c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fe09bf5efd73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fee39bb65e57.pdfIn PDF document text
    • https://xofiguguja.weebly.com/uploads/1/3/2/7/132710561/kawavolanogu.pdfIn PDF document text
    • http://jatuligirez.22web.org/android_tv_x86_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/b5jjb5x/resident_evil_2_revelations.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/c45d7787-02ef-406a-921f-7368437acee0/machine_learning_algorithms_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4627aa-b4dd-4de7-a8aa-d9f480cb5389/bedtime_stories_for_babies_in_the_womb.pdfIn PDF document text
    • http://kososun.epizy.com/hp_2013_ultraslim_docking_station_wifi_not_working.pdfIn PDF document text
    • http://gebozobab.epizy.com/brazil_fifa_world_cup_2014_song.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_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 5232 bytes
SHA-256: 7218d60c2fc4550a44415cc5149b5e6c992dc8faa1624a37b251050b02eed4fd
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10876 bytes
SHA-256: fdc61e2b3d0341318c6a9399b610a1c62078b6e1975817a9ddb2a211428ac7d0

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