Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c420d670683ab…

MALICIOUS

PDF

81.7 KB Created: 2021-05-12 03:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e150ee2c5469ef8b66db9785c7a9fb06 SHA-1: 71a520ed8a7951238f12728583804a6c1e79c7a4 SHA-256: cd5c420d670683ab956c13804b20eb9fc1f680ea8ac709ff89a5c74b8b3ccdea
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=manual+para+tocar+guitarra+gratis'. The document body, though heavily obfuscated, contains text related to 'Manual para tocar guitarra gratis', suggesting a lure. ClamAV also detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=manual+para+tocar+guitarra+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_60642c29d7f9e.pdfIn PDF document text
    • http://cheatyou.site/88539012932ph848.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/dqGwjbK/pazudiwufovixuzijijilimux.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/pdf_to_excel_converter_online_100_pagesvqbqv.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/jfuhgjh/adobe_premiere_rush_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_60550cf7dfbe4.pdfIn PDF document text
    • http://shishkin-seed.xyz/zedoluzovobizojexibetadiiyg.pdfIn PDF document text
    • http://lumacy.site/bram_stoker_dracula_livro12s6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62a31d3599.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/shehegg/upsc_capf_answer_key_set_b_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60660656311a6.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/gfBghFk/cut_paste_photo_editor_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5fcab05648235.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/coR2lfZ/46226166193.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/tanapilamaxi/42846856075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d78f93-f7cd-4edc-9714-a2c4bfe09e31/9901287884.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/3584761343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae8ed67-a4a2-4525-939d-1ce65daeaf37/maya_angelou_birthday_poetry.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/lanejunafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86852437-8e62-435e-88c5-bcbee1211681/how_to_play_johnny_b_goode_acoustic_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/adapter_plug_for_android_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a99224-c04b-4dd4-9a6c-dc830c8a92db/pamefuse.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/gozosaradudukotabekenalin.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_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 5104 bytes
SHA-256: 3c780507802a10f04e00366423b3a34db7cc4b9073e796260f67cf6d51c971ae
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 12228 bytes
SHA-256: c755afc26994af41b0bbabac7195450e45882a42e850598d4c18d70ba75e8a7b

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