Malicious PDF — malware analysis report

Static analysis result for SHA-256 5570f538cb032635…

MALICIOUS

PDF

82.7 KB Created: 2021-03-06 23:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a440ba666450922dda5cb433f1bd36c9 SHA-1: 7e388ab220de9257378159a2367bcb21fb3bc9c7 SHA-256: 5570f538cb0326354474075266b1cf19dbeddf1aed9c34db783014c88dc0d75d
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and potential command execution. The document body, though heavily obfuscated, contains text related to drawing the endocrine system, which is likely a lure to disguise malicious links. The embedded URLs, such as 'https://vilenefex.ru/123?utm_term=dibuja+el+sistema+endocrino+y+se%25C3%25B1ala+sus+partes', are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://vilenefex.ru/123?utm_term=dibuja+el+sistema+endocrino+y+se%25C3%25B1ala+sus+partes
    • http://nuloriwilorij.scienceontheweb.net/sajozone.pdf
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fd296608cfc3.pdf
    • https://cdn-cms.f-static.net/uploads/4464874/normal_5fd158d943573.pdf
    • http://pebifakonek.sportsontheweb.net/81125093353.pdf
    • http://kuworekokinig.medianewsonline.com/72145990533.pdf
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/6510990.pdf
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fdfbcb40370e.pdf
    • http://duzusedolatepe.mypressonline.com/war_of_the_worlds_full_movie_in_tamil_free_download_480p.pdf
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/sedizud.pdf
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/femefunoridozuwit.pdf
    • https://uploads.strikinglycd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezetega/bengal_tiger_movie_video_songs.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/free_request_form_template.pdf
    • https://uploads.strikinglycdn.com/files/83332070-eeeb-4e3f-9b60-f4a6fbd526d6/family_life_merit_badge_pamphlet_2019.pdf
    • http://xipanizi.myartsonline.com/does_the_product_strictly_curls_work_on_straight_hair.pdf
    • https://uploads.strikinglycdn.com/files/870bebb3-5d1f-43a5-a94f-8e77a3d278e6/tepuzabudumijetofapu.pdf
    • https://uploads.strikinglycdn.com/files/9ca7819e-fe64-4215-8f3d-8a53aff9c1b8/26417327552.pdf
    • https://s3.amazonaws.com/benuka/brazzaville_beach_william_boyd.pdf
    • https://uploads.strikinglycdn.com/files/53414560-82c1-4cac-bbdf-840399357cdb/25201991357.pdf
    • https://uploads.strikinglycdn.com/files/ee2b76de-887e-4398-ab1c-8a7a2b70e445/xaxugomufusinobened.pdf
    • https://s3.amazonaws.com/zubuwujoxom/77792787343.pdf
    • https://uploads.strikinglycdn.com/files/8098a040-4cfa-4add-ae24-6de450636d91/do_the_sun_still_have_page_3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a6.bin
4eac72aece0c02bf4839aa03ab75ad347c56ab6c19908fcdd6a4b5e53ab3d830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 5748 bytes
font_01_sfnt_off000117e7.bin
d8d3b3b4d0c34774a2b5f22740281a3c194cefecbee51d330a982dba5a98dae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 10764 bytes

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