Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d3f8f6f8b34ea8…

MALICIOUS

PDF

102.7 KB Created: 2021-03-18 14:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ac0165817b6bc48764b81e5ebbb554fb SHA-1: d78157852e04e200e05a11dcc69fa2fd704dff3c SHA-256: 05d3f8f6f8b34ea8ff4279caab0be5322b6f5a84adbd4afe157e4b21e729d4db
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains, many of which are identified as redirectors to malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to search queries, aiming to drive traffic to these malicious sites. The presence of multiple PDF-specific heuristics indicating malicious redirectors and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=is+macbook+good+for+engineering+students In PDF document text
    • http://buvofigutunam.22web.org/woodmansterne_primary_school_ofsted_report.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/gOigheP/32805431543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5ff37d70b9a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fc77b0742168.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/where_is_the_drain_filter_on_lg_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_60445ccbb3b27.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/the_little_black_boy_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/rhbicoA/50731835349.pdfIn PDF document text
    • https://cdn.sqhk.co/potekovibe/gdgevia/bikini_bottom_genetics_incomplete_dominance_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/ghf5fSy/48497796084.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/analytical_method_of_vector_addition.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/GwMYOih/mafejekem.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/ifsijjh/pet_mouse_keeps_running_in_circles.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/JicNiiv/angry_birds_space_vs_zombies_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_6032a279329f3.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/djcieQm/detigu.pdfIn PDF document text
    • http://jijufik.22web.org/areeya_property_annual_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mozutebileba.rf.gd/the_constitution_of_liberty_ebook.pdfIn PDF document text
    • http://lafasusatar.rf.gd/risatujiwuwuxipito.pdfIn PDF document text
    • http://sojatuduko.epizy.com/93426817529.pdfIn PDF document text
    • http://dipokufaso.epizy.com/how_to_use_briggs_and_stratton_power_washer.pdfIn PDF document text
    • http://tutafibinow.epizy.com/ncert_physics_solutions_class_12_free_download.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/janofukelurok.pdfIn PDF document text
    • http://xaxidos.epizy.com/45790999218.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/gilinalaruruwobapokazadaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001464c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 5332 bytes
SHA-256: 6fc548dbf97db92c6173369eda998186c9ac18d8ef07ff0a7453eddd617f2fbc
font_01_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 11332 bytes
SHA-256: 3098cd0892bb5dc072241861b77a6f9bd8a020518356b4072c60e2beebb218ed
font_02_sfnt_off00017ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378