Malicious PDF — malware analysis report

Static analysis result for SHA-256 34051fe73efa0e56…

MALICIOUS

PDF

76.0 KB Created: 2021-02-25 04:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d4f791f561837cec834e803c789030d8 SHA-1: feb2b3291177fab90341dd5b6f17a80137cac13f SHA-256: 34051fe73efa0e56d02d2ba4713deabb89e1c3b42be25a7df01b189529060470
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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
  • 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://druttle.ru/strik?utm_term=siriusxm+stratus+7+satellite+radio+with+vehicle+kit PDF link annotation
    • http://winovigamaj.mygamesonline.org/el_general_naranjo_caracol_tv_en_vivo.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/gifere.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/iQJdcPG/color_by_number_speed_cars_pixel_art.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/what_are_three_biotic_factors_in_a_grassland_ecosystem.pdfIn PDF document text
    • http://ligorowimilupux.22web.org/what_does_e7_mean_on_my_singer_sewing_machine.pdfIn PDF document text
    • http://gefivinolegaz.22web.org/cashalo_loan_apk.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/zomalebete.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/8800598.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/7171315.pdfIn PDF document text
    • https://fevadejo.weebly.com/uploads/1/3/0/8/130814338/tibaved.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/QjknDgd/buzukuvoratibuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/animal_crossing_new_leaf_face_guide_shampoodle.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/half_nelson_imdb_parents_guide.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/htc_1_m8_screen_replacement.pdfIn PDF document text
    • http://pamixawikisif.epizy.com/wopuletonatiwowusu.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_do_i_set_my_dvr_remotely_xfinity.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/arlo_audio_doorbell_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_learn_computer_programming_for_beginners.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/8109601691.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5644 bytes
SHA-256: 9e861d1052b6f8e544082008111eab68dc1903700396cbb76ddf3853fe40c4e9
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 11348 bytes
SHA-256: 29800a0f6b0c4de3f861efccbd15f26dc296b30f004070343e0069743c2d328a

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