Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66374d033f3505f…

MALICIOUS

PDF

121.6 KB Created: 2021-02-15 07:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 05bbfce6534cbf53c7671bd918db0745 SHA-1: 8f9015c7f92bef5aba9a4505a5e2c864f07d3a25 SHA-256: d66374d033f3505f04ee600c1372f78c3a469ace90aa9c48f6cfa35dbe0a5e7e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to trick users into visiting harmful sites.

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
  • 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://crophysi.ru/aws?utm_term=cisco+catalyst+9300+firmware In PDF document text
    • https://rewapukin.weebly.com/uploads/1/3/5/9/135961798/6710536.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/gisajuzixete_leverokozamukof.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/1874218.pdfIn PDF document text
    • https://vetubopovitomux.weebly.com/uploads/1/3/5/3/135311090/1566747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zafijukopa/la_boite_a_merveille_en_anglais.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/7575343923.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/music_scratch_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/aggiornamento_android_9_tim.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/application_writing_format_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/43781292804.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/animal_jam_play_wild_mod_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/free_antivirus_avast_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/aap_ka_suroor_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/6496801963.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19116 5388 bytes
SHA-256: ad78e3fbf9a05979980b07ab5282e8276bf0cd98c5be905e8bced177f9a8c816
font_01_sfnt_off0001a372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A372 11780 bytes
SHA-256: 7d09b9fac3618cd87a017486548a979f23007455a9a509d752b6f2a532d4a9a5
font_02_sfnt_off0001cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB5F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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