Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de2d827e18d32a2…

MALICIOUS

PDF

71.0 KB Created: 2021-03-22 01:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ef653aa840c053c0077f538a43434b1 SHA-1: e97b29b412f21c02806fef345f82e21024e589ab SHA-256: 1de2d827e18d32a228567447eee6111f792b9ec62a6754de488278cc7effb7ee
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/award?keyword=cambridge+checkpoint+science+teacher+s+resource+book+9+pdf In PDF document text
    • http://idealslimitalia-official.site/films_based_on_the_divine_comedy969hg.pdfIn PDF document text
    • http://rezonansmusic.com/wuxizuml5uv.pdfIn PDF document text
    • http://s7hmus.org/bukenitadazuhfhj.pdfIn PDF document text
    • http://lifeshop.pro/the_best_christmas_pageant_ever_freexrqjj.pdfIn PDF document text
    • http://dfwshootersupply.com/hp_beep_code_2_long_2_shortdbk9g.pdfIn PDF document text
    • http://kezijego.22web.org/cdisc_sdtm_implementation_guide_3._1._3.pdfIn PDF document text
    • http://firstreadersclub.com/valores_y_principios_moralesrd8tm.pdfIn PDF document text
    • http://jobs-ingenieur.best/54209551878f3s3t.pdfIn PDF document text
    • http://masito.space/krups_ice_cream_maker_user_manual802bq.pdfIn PDF document text
    • http://presalon.xyz/the_giver_discussion_questions_chapter_1bmbtw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutazujedumixa.rf.gd/warcraft_3_reign_of_chaos_prologue_campaign.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_c322ce2d2b7a48a5bf3962075a5ca67c.pdf?index=trueIn PDF document text
    • http://gepubefe.epizy.com/good_fishing_lures_for_striped_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/46557274960.pdfIn PDF document text
    • http://tesepesizaz.rf.gd/xazadirulufinojorovizo.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/dinosaur_king_arcade_game_battle_free.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_843b7e2a72da4ac49d260bb1b8223546.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/78823151870.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_3f56b4cabf0149908fca256f9884d3e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/39319191275.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_4e874a3f397f4d2cb62fbbb8c81804c1.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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 5804 bytes
SHA-256: e6c5ca9d721bb9d69fc80d3f0497fc2851b5ab274bc6eaee8ad29a0c062470ff
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10852 bytes
SHA-256: 9818c2fc7f3af64935f38dfc6bd58bcfbdd33b2f41d2a12ea2f62976132ec6c0

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