Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd87e14db45b6b6…

MALICIOUS

PDF

81.2 KB Created: 2021-02-27 01:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f77f02a335b9fc777fc81e96dfa359e8 SHA-1: 78d7cd69e6d644d86fd27eb86bde37f5d7d9802e SHA-256: 8fd87e14db45b6b676991d25496854abac9d9aed0bb5be19b943a2963b319e04
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'kindergarten reading fluency passages pdf' and the wkhtmltopdf application, suggesting a lure to disguise malicious links. The presence of multiple disposable domains and link farm characteristics further indicates a phishing or malware distribution attempt.

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
  • 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://soxebez.ru/strik?utm_term=kindergarten+reading+fluency+passages+pdf PDF link annotation
    • http://kirakexig.mypressonline.com/36127000824.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/bugonubagigikelum.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/the_complete_works_of_swami_vivekananda_volume_1.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/vetujirakekurawim.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • http://pugumatinudozid.iblogger.org/divokovazidoruwifibojadus.pdfIn PDF document text
    • http://lamenomapod.iblogger.org/11602475.pdfIn PDF document text
    • http://damvglaz1.xyz/zijazoxube5rhs3.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/briggs_and_stratton_500_series_158cc_carburetor_adjustment.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/355_gears_vs_410.pdfIn PDF document text
    • http://littlenat.space/8979992926866cil.pdfIn PDF document text
    • http://trudogoliya.online/93637320960vf6tt.pdfIn PDF document text
    • http://mx50off.pro/grams_to_moles_stoichiometry_worksheetfajia.pdfIn PDF document text
    • http://rewirujekinoxex.iblogger.org/vidiges.pdfIn PDF document text
    • http://roskycnmx.com/85191169874lhber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujugefov.rf.gd/sepas.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5396 bytes
SHA-256: 20780bd3caf03f6b5de6ae0bc60ba9c923fca305e352e76115b31751f49c315a
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 10924 bytes
SHA-256: f3d14fd804155c910f2d303fa89986329f36d5ae4430cfef2acb3da189f52650
font_03_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

Open this report in the interactive analyzer, or submit your own file for analysis.