Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811d49b057b29f3…

MALICIOUS

PDF

82.2 KB Created: 2021-04-17 13:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7669007201c40f4170aa283f6f329a9 SHA-1: 7d776321a0e1f34394bec1f98f69e04737a447e2 SHA-256: 5811d49b057b29f3b980761e1948fa71fb43b9cc01ccb896df1af6867860ec33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with a primary suspicious URL pointing to 'seumenha.ru', likely intended to redirect users to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'tabla periodica de los elementos para imprimir hd', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=tabla+periodica+de+los+elementos+para+imprimir+hd
    • http://gnfcns.info/how_to_program_my_marantec_garage_door_openeruthoi.pdf
    • http://zusiwibewire.mypressonline.com/little_black_boy_analysis.pdf
    • http://pewodebepefawi.scienceontheweb.net/72084481538.pdf
    • http://instasale.company/common_sense_book_report9sni7.pdf
    • http://kanaxade.mygamesonline.org/35708460911.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_20f819c774c043558b61404094068027.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23e6470c-c6be-4e78-a199-2749a93be10b/vitamix_smoothie_recipes.pdf
    • https://s3.amazonaws.com/woberiz/51495589678.pdf
    • https://s3.amazonaws.com/safago/focusrite_scarlett_solo_for_mac.pdf
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_0e44006563e34410a1234ad4cebb01ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0753f666-66ec-4dca-9b02-d1e7b0ee232c/cuisinart_coffee_grinder_instruction_manual.pdf
    • http://pilejifizodan.onlinewebshop.net/roxejukitudedosuje.pdf
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_83b10878bd8b42a4b8ac9ff85c604a56.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c98e772d-0a02-47b0-be40-db43bd69d7bd/89404760245.pdf
    • https://s3.amazonaws.com/xirixepo/50117758333.pdf
    • https://uploads.strikinglycdn.com/files/1deebde9-0e1c-4a8f-9cb3-df896ca97c01/how_to_connect_shared_printer_in_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/3ad580fc-8e30-48a7-983a-1631d1943d61/65021500766.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_off00010334.bin
575c0bbcd405bfa3ce1ccfff40b2338137f5a03b8a5684c2a54b5ce1c89f17e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 5404 bytes
font_01_sfnt_off00011559.bin
582f4ec31b21c8926fa34e71b055f228075878e57f3f0a0b088933227d979898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 12036 bytes

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