Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc95794e0fd40f…

MALICIOUS

PDF

70.2 KB Created: 2021-02-28 07:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7949360a233c2cb305f140faf75c59f6 SHA-1: 070170b63234efafe87d0fb196c5f000c0b10cc6 SHA-256: 25bc95794e0fd40fb07f7013ecb9df9ea556ddf43e1d2538ede472d8e20eb082
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 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.
  • 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://botokaw.ru/aws?utm_term=char+broil+4+burner+gas+grill+parts PDF link annotation
    • http://copyrightsupportforlnstagram.com/kohler_20kw_generator_owners_manuale17um.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/TMXhiao/9757484064.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/davv_cet_last_year_papersi24pd.pdfIn PDF document text
    • http://birjand.design/free_litecoin_spinner_apk_2019z0iyi.pdfIn PDF document text
    • http://sexesex.site/jo_badal_barse_song9ty5o.pdfIn PDF document text
    • http://doucheop.xyz/binary_search_tree_insertion_and_deletion0qgag.pdfIn PDF document text
    • http://rollernefritmassage.xyz/wovogasg3vln.pdfIn PDF document text
    • http://sunny-web.ru/crossfit_level_1_training_guide_arabicgwc1o.pdfIn PDF document text
    • http://speak4pro.com/23878487669zmrb0.pdfIn PDF document text
    • http://spiritstudio.ru/tujirorixikututikiromuvim3qtz4.pdfIn PDF document text
    • http://amandeepsadyora.com/boolean_algebra_tutorialbd3yi.pdfIn PDF document text
    • http://all-casino.xyz/globo_reporter_brasileiros_na_alemanhae5ru2.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/BjciDqx/73635975508.pdfIn PDF document text
    • http://stepka2016.xyz/fokesobj5n8h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumizasikoxef.rf.gd/xetovo.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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 5216 bytes
SHA-256: 4375ec5cb4616b9ba21eb28518e6c9c3c2fbe02b28172c90d7cf267392a2fd24
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 11120 bytes
SHA-256: 5e7530d0089b3e24a6b8286e4c887f288bc5b10ad82bd9808245f0e67bdaaba6

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