Malicious PDF — malware analysis report

Static analysis result for SHA-256 8475d3503f8c6aa1…

MALICIOUS

PDF

89.0 KB Created: 2021-03-18 10:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dfbce8fea9e1801800d082649e0db9f0 SHA-1: 2062f13e4914a5ad62ed8f8b881bf09d02f0b8e5 SHA-256: 8475d3503f8c6aa1df78e10850e879697053dc9f18b9194d96feb83a74ee4bff
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of 'LOLBin token sequence in document text' suggests an attempt to disguise malicious commands or links within the document's content, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/wix?keyword=udemy+coupon+may+2020 PDF link annotation
    • https://cdn.sqhk.co/vetelojid/hLidYgc/chipping_campden_school_sixth_form.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/a6721a69.pdfIn PDF document text
    • http://febugidomoxasez.22web.org/1568663856.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/5777444.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/gXA2zwv/togapovinojewitepubitega.pdfIn PDF document text
    • http://fuvelude.22web.org/tejefesezosulefitukutiwij.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/8894613.pdfIn PDF document text
    • http://watercart.ru/87840176713g6j0b.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/aJGggjg/duty_wars_ww2.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/bTapghR/16246219530.pdfIn macro / runtime command snippet
    • http://alisabor.design/best_way_to_clean_hayward_salt_cell9i0bx.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/772408.pdfIn PDF document text
    • http://macsk.space/excel_vba_worksheetfunction_listu21az.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/jedivipamirexe.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/d1a8aaad2.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/hgjjg36/k_pop_band_bts_dynamite.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
    • https://s3.amazonaws.com/jixeremipet/street_fighter_4_apk_data_androidgamegratisan.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/viktor_frankl_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/what_2_elements_are_found_in_all_living_organisms.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/curling_wand_size_guide_mm.pdfIn PDF document text
    • http://rexenejo.epizy.com/casio_g-shock_ga-100cf-1a9dr_g519.pdfIn PDF document text
    • http://sojuwumupipijo.rf.gd/audiometria_impedancyjna.pdfIn macro / runtime command snippet
    • http://mojedebebetum.epizy.com/cover_letter_canva_template.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://rexenejo.epizy.com/casIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 5032 bytes
SHA-256: bc9416591bf9015aa6f162d3c323d3a7c742c6914decece0254aa2d1cccace80
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 11732 bytes
SHA-256: 411e46d22eb160c66190689653d1cc8cd37efa978a358c5200c2764853d213c2
font_02_sfnt_off0001486d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e