Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5846d8cb290079…

MALICIOUS

PDF

72.5 KB Created: 2021-02-24 07:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a36f8e3349dd2c015d7fb79a6b960eae SHA-1: d3efcb1790c3c1df46fd2aa20e3658072b3e1d8f SHA-256: 6f5846d8cb290079a9fd9ff1c62db18fc76752bb4f79ca2276e98648aae71444
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to historical topics, attempting to disguise the malicious intent. The presence of numerous links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+was+life+like+for+a+peasant+in+the+middle+ages In PDF document text
    • https://cdn.sqhk.co/vowibesep/cpegeia/spotistar._com_spotify_promotion_for_artists._com.pdfIn PDF document text
    • http://wuzidifefomir.iblogger.org/vidukathai_in_english_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/dicgc4b/share_files_login.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/eiigehj/wepolusasekubale.pdfIn PDF document text
    • https://cdn.sqhk.co/wemulekojex/kRHdhfy/6081740704.pdfIn PDF document text
    • http://goshop32.site/3962518967734vs2.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/uihjihf/urban_dictionary_word_of_the_day_calendar_2019.pdfIn PDF document text
    • http://gnfcns.info/sangrado_de_varices_esofagicas90thd.pdfIn PDF document text
    • http://badge-verification-center.com/13755034151if351.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/vdRhejb/download_game_tower_defense_crush_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavasokunise.epizy.com/27418855575.pdfIn PDF document text
    • http://lowuzoduveloga.epizy.com/matchstick_puzzles_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/bonareditopojukolokebaput.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/41551177150.pdfIn PDF document text
    • http://girafarurogu.rf.gd/card_college_by_roberto_giobbi.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/luvezitubegukigudew.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/will_there_be_dark_souls_4.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5624 bytes
SHA-256: bf1f034420bb0e34ed5e0826f04bb901a3147f445ca5f92a5be2f5eea19b854a
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10600 bytes
SHA-256: 0fc54b665967b02307adc5a7fb9721e7482b6e46d753f1e98dea9e47cfdcf8b2

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