Malicious PDF — malware analysis report

Static analysis result for SHA-256 596a266a75915e3c…

MALICIOUS

PDF

85.5 KB Created: 2021-04-07 10:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5e223b1efb53b3ca9c6e2f87de170cd8 SHA-1: 1a8a072c7c40803d40b9242471a29ddcec169464 SHA-256: 596a266a75915e3c43bc5b805ef627ca02013df0c2534f967fa1925ea0b1284b
146 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 a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('nipisod.ru') and another to a link farm ('texitow.iblogger.org'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/123?utm_term=uc+browser+free+video++for+pc PDF link annotation
    • http://texitow.iblogger.org/gibogaxetomizovawuxozona.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/catch_up_growth.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/the_turn_of_the_screw_by_henry_james_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_e83477591a554f8fa03703bb340334c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figidireki/english_phonetics_and_phonology_peter_roach_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/barsaat_movie_1995_full_hd.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_c9e6d3aabfe44ad9993d1f61f9ea4aa7.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_aefbc2de13574cd599d0e8125eda73c4.pdf?index=trueIn PDF document text
    • http://sojufuka.atwebpages.com/defending_jacob_season_2_who_killed_ben.pdfIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_c6bf0d421ba34080bfc5e9152f8f2fb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/86486953937.pdfIn PDF document text
    • http://xuruganota.epizy.com/37971821735.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/businessman_2_south_movie_hd.pdfIn PDF document text
    • http://medetoti.epizy.com/baskerville_font_family.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_90fe1b54034c492c80a50bc8be4fd6d9.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_de804aeca218493e85e84a83e58d0c50.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_36521b2157c34600b46223b822896370.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_7d87be2576cf4966afc0df04ffa5bc3b.pdf?index=trueIn PDF document text
    • http://xotaxebotejij.rf.gd/angular_4_format_date_pipe.pdfIn PDF document text
    • http://pobikifi.rf.gd/88817503384.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_5e64acf9151f4500ac93d84ac69b26ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/wuvosonaj.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/lufogukebegunivikijer.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
    • 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_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 5188 bytes
SHA-256: 1ae5c3e8e5612eaa345851588ee1661fd6c11b639adabf027c376a041f9b880a
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 11144 bytes
SHA-256: 6cb649bca4e259d106e5d74c8137ed7bf86cb4eecbf8f53b66aef757053541e2
font_03_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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