Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d8073e378a01ae…

MALICIOUS

PDF

86.0 KB Created: 2021-02-21 07:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9b44bc4a73fb0daf6a62756d6cfb27f SHA-1: 5bf3857f85cac659b73c4ed95552c70ca3d99527 SHA-256: d1d8073e378a01ae8000c22429cadb2b1b3b92695728d2aa999a09a3b499be20
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=yeah+it+would+be+great+meme'. This, combined with ML and ClamAV detections, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text fragments that appear to be lures, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=yeah+it+would+be+great+meme In PDF document text
    • https://cdn.sqhk.co/vimexuda/0AKhjig/5695112735.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/ghjchgB/bibokagakilakorovopoma.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/BgighlA/pro_taxi_driver_crazy_car_rush_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/ihNjdjb/xusigejepug.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/2Ggiehj/girl_in_the_box_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jgdgh7M/lego_batman_beyond_gotham_3_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/gNRGYIy/car_driving_games_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/etEBsgd/70810667646.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/ihfTLMv/elite_hockey_prospects_2002.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/E2Sygdj/safe_worship_song_lyrics_tagalog.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/hjegfgf/scary_forest_sound_effects_free_download.pdfIn PDF document text
    • http://urolog.xyz/linking_verbs_and_action_verbs_worksheetspjjx7.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/PCyOchj/fidelovamatufe.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/rakuza.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
    • https://s3.amazonaws.com/kosamupim/formacion_de_boca_hoy_contra_river.pdfIn PDF document text
    • http://vewamekigobuzuw.epizy.com/94680475230.pdfIn PDF document text
    • http://lozibudakumanik.epizy.com/roland_xp_80_price.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/42723873170.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/agro-_ecological_farming_systems_in_china.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 4960 bytes
SHA-256: 91a140db59c8233345f8d1fa1d804e0b159063d8c1530709a0bb638ca4b0f104
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5028 bytes
SHA-256: cd6636acd5f20d43e649addb7c9dc15401e908bbad7b24f4ef391af002552535
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 11968 bytes
SHA-256: 998dea5ff94604723c3103e9f0024e4c4df1b9d387128f5d6f6d9929be33e289
font_03_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 16080 bytes
SHA-256: ce6c9a31222968989703f653af24ef420cae08753b095152a9eff5d9cedd60e7
font_04_sfnt_off000139eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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