Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d21a99fcf5224…

MALICIOUS

PDF

76.7 KB Created: 2021-02-17 23:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6e46e9a9691a50964f0ce1f5193364d SHA-1: 7a9bad29d5a03506c821427c19a08f5f58cd2d93 SHA-256: 236d21a99fcf5224cb100187972993b7b97a0a18aff3beac9897694e6e064906
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly suggest an attempt to redirect users to malicious content.

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 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=kathie+lee+gifford+today+show In PDF document text
    • https://fojinotumure.weebly.com/uploads/1/3/0/8/130874368/4d877261.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/satujuxufov.pdfIn PDF document text
    • http://bizbize-yeteriz.org/audatex_estimating_software_freer5z58.pdfIn PDF document text
    • http://avit0.cc/quick_chocolate_chip_dessert_recipesqfk3r.pdfIn PDF document text
    • http://securespot.ru/cause_and_effect_essay_samplesz914c.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/f781b8de5b.pdfIn PDF document text
    • https://famelugosa.weebly.com/uploads/1/3/0/8/130873944/gamus.pdfIn PDF document text
    • http://votofeveta.iblogger.org/21529206637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_60062c8107658.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
    • http://zajunevoza.epizy.com/47079334733.pdfIn PDF document text
    • http://xatosizukav.epizy.com/indesign_layout_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/maderuzipid.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/chinese_song_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/oracle_forms_11g_formsweb._cfg_parameters.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/nufatitoxamugavamodatiwin.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/38435522951.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/hanuman_aarti_song_free.pdfIn PDF document text
    • http://sovizaz.epizy.com/hogwarts_letterhead_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/24488933873.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5012 bytes
SHA-256: 3f75d5d73e52b587213acc8bf297d21d005bee749cf770badb97147cb55957b0
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10808 bytes
SHA-256: db94792b3a1c559eb53884a98eed993dc80ed18ee25e96eea8c43f2f25612917
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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