Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aacbb85e55bc4a8…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 11:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b780521266c9216359f99828c2a9ee68 SHA-1: 0e180eda5d603234555883871b4295332bbc9738 SHA-256: 0aacbb85e55bc4a85604e5f2f534719be8e966203451412a1f9b825edaadfb83
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 hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/123?utm_term=biography+writing+sample+pdf PDF link annotation
    • http://azalea.store/1_bachillerato_english_exercisesnn3pl.pdfIn PDF document text
    • http://xonibiz.22web.org/zeraberitusufope.pdfIn PDF document text
    • http://loveworld.club/worksheet_atomic_structure_chemistry_a_study_of_matter9fj0m.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/walipigaximopur-xefomi-vexuwuru.pdfIn PDF document text
    • http://7lessons.space/42296444672ym5x0.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/352557d86e16763.pdfIn PDF document text
    • http://mabay.fun/division_worksheets_year_3_ukwjjgr.pdfIn PDF document text
    • https://wawodedirikib.weebly.com/uploads/1/3/5/3/135348651/4918032.pdfIn PDF document text
    • http://dowator.22web.org/73749906193.pdfIn PDF document text
    • http://yewes.fun/vezulexivobubfe92d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ed49e7-f4f1-4e4f-a635-27db6aedc0bc/sudujofika.pdfIn PDF document text
    • http://koxaxinum.epizy.com/how_to_use_the_magnum_x7_sprayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0168bc6-f1d2-4d58-a4d6-2618e23043cc/programa_de_estudios_2011_primaria_quinto_grado_ciencias_naturales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fad282-2110-4579-a128-05b2b9e3286e/what_channels_are_on_dish_satellite_129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29d1f28-9ca3-4987-9ff8-6e32d71c2731/evangelism_and_the_sovereignty_of_god_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f76904-5c27-46f1-93a5-6cff5b1942cf/how_to_repair_crack_in_whirlpool_tub.pdfIn PDF document text
    • http://nulebizazawivuk.epizy.com/homophones_sentences_worksheet.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_a98d394f19354bf59c1d98ba65565cfa.pdf?index=trueIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_e1418ebe8fc347eca79d486b09c94fe9.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_5fda0435d57440c0b8329e374c2e6391.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_85f70d0c770448e5b4c9db9bfd08b9d8.pdf?index=trueIn PDF document text
    • http://bimomog.rf.gd/11305123943.pdfIn PDF document text
    • http://kuxexulotubi.epizy.com/56739008707.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/good_will_hunting_movie_hdpopcorns.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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5700 bytes
SHA-256: 6ab0f613a374400f0d4e520f6001ac859a5b638b32d14e89dd315257de3df98a
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10360 bytes
SHA-256: 774ce7071ef86b41015c0beed8aa01b73637a4b96cd45c71e42bb3529ad7e5d4