Malicious PDF — malware analysis report

Static analysis result for SHA-256 2718c291cac21018…

MALICIOUS

PDF

87.0 KB Created: 2021-04-12 17:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d5ed9ac5ee2344468c6bee5c1f8f1594 SHA-1: 69c2fe19de9a9517426480021b719d11de28c26e SHA-256: 2718c291cac21018143366986be8427194263e51dccc2e5f9ee708d74070ee05
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://resalured.ru/strik?utm_term=nikon+af-p+dx+nikkor+18-55mm+lens+hood PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452206/normal_604144d16657d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5feb0261bab54.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/dovej_mojapuga.pdfIn PDF document text
    • http://eeeeeyyy.space/40783637572r4lzc.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/laboratory_diagnosis_of_entamoeba_histolytica.pdfIn PDF document text
    • http://beweroxaku.66ghz.com/62631368697.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/3962799.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/667002.pdfIn PDF document text
    • http://questotzvezd.space/glast_heim_devil_wing_quest_guideliu8r.pdfIn PDF document text
    • http://zubudiru.sportsontheweb.net/environmental_risk_assessment.pdfIn PDF document text
    • http://vienvozvrat.site/who_is_bruno_friend_in_the_boy_in_the_striped_pajamaszy542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603705ceb2b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_603b7e49bb8bb.pdfIn PDF document text
    • http://opt15.ru/what_do_one_word_answers_meanttuin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ruzakema.onlinewebshop.net/medical_science_liaison_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/tezokaxinosemufeditape.pdfIn PDF document text
    • http://jogulele.epizy.com/laxepidixedi.pdfIn PDF document text
    • http://bejopirobi.epizy.com/46100781183.pdfIn PDF document text
    • http://resawopo.epizy.com/42122237090.pdfIn PDF document text
    • http://kejipokope.rf.gd/new_english_file_beginner_student_s_book_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/dd_map_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/numerical_recipes_pascal.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/7798323291.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/vaccine_adverse_event_reporting_system_vaers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 5492 bytes
SHA-256: 224987e8c92d7d0f65cfe8174b25a314354ef9001f4aa27b745799d8168cbfd2
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 11620 bytes
SHA-256: db12aaff42122117f2f41a8683667e6e4f2c16fbe10de1e02a5912079c9622d0
font_03_sfnt_off00013faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c