Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fb1c73c09d0278…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af38ad7e816dacd59253881ff170e857 SHA-1: 1aa8f5586ba8e53152132b6da8fc01db619d1276 SHA-256: 43fb1c73c09d02784b845286b1cb57c4eeff4a1135d4c5caa3b70fa5a48b33d4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link farm services, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that suggests a lure related to 'chicken noodle soup song mp4', possibly to disguise the malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=chicken+noodle+soup+song+mp4 PDF link annotation
    • https://cdn.sqhk.co/pubusudes/aEd53fX/31694446164.pdfIn PDF document text
    • http://gojodefigogizib.iblogger.org/yahtzee_junior_score_sheet_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/ajb0p25/18251176907.pdfIn PDF document text
    • http://rankingcoach-seo.com/14698162295kngh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_5feee03e88e77.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/9ef8fa5.pdfIn PDF document text
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/17ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_60216fca6cb21.pdfIn PDF document text
    • https://cdn.sqhk.co/seruribemoju/bhbiehb/yandex_browser_apk_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/Qhjihjh/88986682568.pdfIn PDF document text
    • http://just-gopro.com/popokika538dj.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/2IhdhcZ/ninesekabasonubegesuf.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/0928f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_60191182c996e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_603631e2a1210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopusenegi.epizy.com/process_capability_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1332810f-00e3-4531-aba8-2b9737076c87/great_writing_4_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb3f438-9055-4778-8186-e5bc8cee4bfd/nikon_coolscan_v_ed_film_scanner_review.pdfIn PDF document text
    • http://tiladolukix.rf.gd/catasterismi_eratostene.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/50571995928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a11a7db-2e78-452b-9fc9-4e916835ff49/92501253826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a4cb50-74da-4958-9d7b-0f99b8b9e381/easy_side_jobs_to_make_money_from_home.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 5236 bytes
SHA-256: a4a2bbce9cb1c292cdbeba2a6cbeebb4a9d913d9881788660669449f7b4c055c
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 10448 bytes
SHA-256: cd41fcfc84426d0f862151863a288a451dedf2e8b3a14bda441278de28ddbf42
font_02_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 18776 bytes
SHA-256: 1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6