Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d7ab5d8983fe60…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 13:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb6fdc984677646169e91d97fbc93b6e SHA-1: 81e4480ab796316fa559194a41630b7c1ecc9d89 SHA-256: 56d7ab5d8983fe6040704267eef617f5be8aa82a35e5927b51ccc470731d9d9b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=kinematic+equations+of_motion_worksheet', which is flagged as critical. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a compromised site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=kinematic+equations+of+motion+worksheet In PDF document text
    • http://jirafka.space/lulajefuvexemixmk2wl.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/hhjghgI/31418746728.pdfIn PDF document text
    • http://homebig.space/role_of_information_technology_in_bag9z9z.pdfIn PDF document text
    • http://affilateapp.online/wafizogozagimukugexowasedw7q3r.pdfIn PDF document text
    • http://accueilcmb.com/facebook_app_dark_mode_for_android4ext6.pdfIn PDF document text
    • http://alex-travel.moscow/sumbangan_kerajaan_bani_umayyah_dalam_bidang_politikndep6.pdfIn PDF document text
    • http://getsol.xyz/lokatebiwadevpew0q.pdfIn PDF document text
    • http://womans30planet.com/25352174662tolsk.pdfIn PDF document text
    • http://rollernefrit.xyz/93497921322g8fws.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/gaferonigumanevufuxerit.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/where_she_went_book_series.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/sepisogeresonatag.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/72216533930.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/statin_guidelines_aafp.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/ascending_descending_order_worksheets_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/aadhi_bhagavan_tamil_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/be_with_you_eng_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/41273886927.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/morula_blastula_gastrula.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_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 5340 bytes
SHA-256: bc2611eba1d7e10cc6340a26d33d4145e8700e342e43c458b1b32b0989f9c79c
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 11348 bytes
SHA-256: 037a9262eaf956e145645089458986c532e8acbb40bd366dcf51c2de7bb3aff6

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