Malicious PDF — malware analysis report

Static analysis result for SHA-256 1003b032680b6af5…

MALICIOUS

PDF

75.1 KB Created: 2021-03-04 13:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 45e997e9061da4c32db273494a49f4c8 SHA-1: be647aa45e3eec49c3dc04def01dcb52e853f7a8 SHA-256: 1003b032680b6af56edbae59bacfcf0ae53b49db9cf18e941ae230300656c2ad
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a mass external link farm, with numerous URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=formula+para+convertir+pulgadas+a+centimetros PDF link annotation
    • http://dosubodanes.mypressonline.com/72414905480.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/194001.pdfIn PDF document text
    • https://zemotoru.weebly.com/uploads/1/3/2/6/132695551/zetepavojutik_pagujajanod_lelobajitadu_fibeg.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/6NIe1wm/86492906345.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/9ca5d.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/nimopagafaza.pdfIn PDF document text
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/bdf52a14c17d.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/4004407.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/gjjieSq/nursery_rhymes_songs_for_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/glILnic/baxeketuvomitofavix.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/kjdhdJs/block_mortal_survival_battle_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/LijYTig/lonukifexutew.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/cibgjib/famous_viking_hunters.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/4iaQqij/stickman_legends_shadow_warrior_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/ictgfhj/mind_games_to_play_by_yourself.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/iX80mp5/keto_shopping_list_walmart_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_228762fd6fc9450f9c1a8d165be50ef9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/427f4e0d-2f42-4831-9b29-2835ec7c9d18/togoseza.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_c205b87b57444af5ab907c38b95dddef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9144fd-a461-4062-8d53-250d6cf936a4/lutozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8f1e8d-2a07-4b24-a88e-7c854f020d39/ms-7778_ver_1.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bddc71-b9b9-4cf7-bbbf-a9d4ad5d6207/exerpeutic_900xl_recumbent_exercise_bike_with_pulse_manual.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_ab53c6fec777444890011020df211b6a.pdf?index=trueIn 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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 5408 bytes
SHA-256: e50f7bb99faa08945a02fc3e839ff82b2001311bff0b46d224ad7ed5445ae571
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11320 bytes
SHA-256: 94457c9206d1eb3635a9157546e1e42c8f43a5b44bcbfca9a39844ab91e5b487