Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c82207e4d116bb…

MALICIOUS

PDF

77.0 KB Created: 2021-05-16 20:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 73924f6f7e9e8b627eb6922f5591544e SHA-1: 32a51d4d140f0d318ebe5ab4d667234194749641 SHA-256: 51c82207e4d116bb8a4aedf5923412d2001477266244e7715c24f13d3c0c48aa
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru' which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to common technical support issues, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=how+do+you+get+a+hp+printer+from+offline+to+online PDF link annotation
    • http://pidusejop.medianewsonline.com/artificial_intelligence_patterson_download.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://mylic.ru/at_the_cross_hymn_chords_key_of_c9j7sb.pdfIn PDF document text
    • http://enots.space/59608271850suvir.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/rezawuvovipiradugaj.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/dudejejexawut.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/bhagavad_gita_book_english.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/can_lower_back_pain_be_cured_by_yoga.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/how_to_jump_higher_in_zelda.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/labazituwu.pdfIn PDF document text
    • http://saburogamo.iblogger.org/how_to_connect_bluetooth_on_clarion_cx501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxonelotod.epizy.com/kofokexoga.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/machine_learning_clustering_algorithms.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/html_code_for_login_page.pdfIn PDF document text
    • http://dewifazegukom.epizy.com/33865701607.pdfIn PDF document text
    • http://tevomare.rf.gd/81836946430.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/86295121042.pdfIn PDF document text
    • http://rojuzejuleg.rf.gd/what_is_performance_number_in_ic_engine.pdfIn PDF document text
    • http://suzitemilivofer.epizy.com/83413855002.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/rusexaxugaributevoturip.pdfIn PDF document text
    • http://rajowezurub.rf.gd/fidinemujotesetigazik.pdfIn PDF document text
    • http://jawuguv.epizy.com/zemana_antimalware_portable_free.pdfIn PDF document text
    • http://fojeropiralamab.rf.gd/hair_in_funny_places_babette_cole.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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5432 bytes
SHA-256: 35ed19cc92142b93e112eabb6d3a73958f450e0bb486ae92181ce4fb3d43bde1
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10296 bytes
SHA-256: 3b966676e3a1e7bd16f1ef8e457ff929a370d99e8e9a2e21bd4a1a393749a487

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