Malicious PDF — malware analysis report

Static analysis result for SHA-256 deedd35575e46b1c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 01:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fb0c7752a5feeb345181dd876a249e1c SHA-1: 3614feafa8543f8fdb2cea2b651b9aeb9ce409c0 SHA-256: deedd35575e46b1c2ca1cc518b99caa3d34f26fcf55b7285ead66a0139866d24
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, with one pointing to 'nipisod.ru', suggesting a phishing or malicious redirection attempt. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/wix?keyword=spyderco+matriarch+2 PDF link annotation
    • https://cdn.sqhk.co/lisakopew/ieibKAe/ballerina_grade_2_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/KGgdjaf/10880688518.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/hdgikic/shadow_fight_2_special_edition_apkpure.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/how_much_is_a_bowflex_bike.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/hoover_spinscrub_50_upholstery_attachment_not_working.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/nekijuruferulo.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/hh5Rigi/jowirudegokekep.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/how_many_words_has_war_and_peace.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/326cec79-2294-4cf3-81e5-52ae24712e54/where_are_craftsman_miter_saws_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fff2b4-eba6-46fe-83d6-799dbc93d61d/how_to_replace_an_auger_motor_on_a_pellet_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09dbcc81-b7e7-4494-8b45-9848a687351c/panchatantra_stories_in_kannada_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2b3ed4-f630-4eb5-ae93-7148060c10cf/66573406929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb986435-ef6c-421c-ad66-922c565052fc/pudoguwikavudevuburumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcc1722-2f4e-4156-9252-85be58cd917e/delaviers_core_training_anatomy_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7483e33-eee1-4dff-9025-dc5ec5cf644d/why_wont_my_epson_print_black_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf53d106-fffe-428e-b4b2-70cb5061355c/i_spy_with_my_little_eye_rap_song_lyrics.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b4eea48d0b534cbaa662c082d9109b66.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_51321e6ea66d4c3699dab62e6f03ae7f.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_e63d868714344c83b752c8db39cfc0a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebd08f1-5cf0-47a9-8f4a-68056c3f5857/99917565677.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_c44c8ce611ec4686a5abbe42bd6f3e03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddf17d8-d093-43bd-a4ca-5871966661de/92213710436.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_37f8a0f51f224305a847c6275f064f6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3ad28e-fb54-435a-bbca-882a23b3ce32/gitefojalojudijo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5440 bytes
SHA-256: 29fbdca297303db3e14c4066a0ad2cfee8b0f52514cd4d0750adedd289f0059c
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 10732 bytes
SHA-256: b70be65c14982fb2409e78b72dfd4f55a2f00236636154c71c13070f1055c279