Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ae2deaf12485bb…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 22:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27781393e4585eed355129be09750e9b SHA-1: d13f40aa990ea2c0b66a06cd6011ba714949bcd4 SHA-256: 23ae2deaf12485bb8ce2fdfc02b9321621e1b6c6917d353c1f02fa394157ce71
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful external sites, possibly for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself can execute JavaScript, contributing to the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=and+all+i+want+for+christmas+is+you
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/dufuziwenemo_senuxi.pdf
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/jipinike-jakiwuwajenu-papub-dutusoxiw.pdf
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/womekaz.pdf
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/7294029.pdf
    • https://rikulaseno.weebly.com/uploads/1/3/4/4/134471776/562ad29f1.pdf
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/felelo-kobobinixusom.pdf
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/64b19a09.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/nanubakeromopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fa9af29-9066-40b6-9f39-10bb3eab20a1/kudosejipatoxojugifaz.pdf
    • https://uploads.strikinglycdn.com/files/92a2ab4d-17f1-4474-a7b4-34e17253e249/94694575115.pdf
    • https://uploads.strikinglycdn.com/files/8914d5e2-7617-49e2-9845-0e7c69b1ed4c/libro_de_los_sueos_y_numeros_san_cono.pdf
    • http://fajopab.pbworks.com/f/what_is_the_time_frame_between_the_old_and_new_testament.pdf
    • https://uploads.strikinglycdn.com/files/d9ac16da-5395-4267-a6f3-06dfeb46b220/convertible_crib_instructions_toddler_bed.pdf
    • https://uploads.strikinglycdn.com/files/1bca1f91-28e5-4fad-8e0f-48bb6f423cc6/danarolitasi.pdf
    • https://uploads.strikinglycdn.com/files/502713d9-3caf-4fd2-99ee-7866db0c7922/how_to_get_the_metal_team_leader.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144425073/vaferavemaxifixagun.pdf
    • https://uploads.strikinglycdn.com/files/8c05079e-9b8a-457f-8d25-fc02122d3135/vonimegebamivimujuronuti.pdf
    • https://uploads.strikinglycdn.com/files/6ab602b9-78b5-47f3-8ce2-62c734e3a19e/65561783150.pdf
    • https://uploads.strikinglycdn.com/files/faf8de10-3374-4c1a-8371-a619eca1db46/ridufofikarezemejaz.pdf
    • http://wiwedano.pbworks.com/f/98380094218.pdf
    • https://uploads.strikinglycdn.com/files/ba2a78b3-5b2d-4751-b249-d90880de52c1/shadow_and_bone_tv_series_plot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e843.bin
bfeeb53d83501a1e8fd5a0bbb58509a33c85ff0a96e275e2f719c13841cae58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5444 bytes
font_01_sfnt_off0000fab5.bin
51ee1e91c6b1a5d6160bbb5260604397792243ca2adace61867ab74b8503e37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 11900 bytes

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