Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29a2fbd41072e91…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 20:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eebe09f84b22067a959b1f0a3c48585 SHA-1: b17e01e080c03a3c7271fd46aaa7d5f45bade655 SHA-256: c29a2fbd41072e911c8ed34120478cd6cbb03a86d061c9ee875758a7e55680f6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the structure suggests a link farm designed to drive traffic or potentially host further malicious content, aligning with a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=when+to+use+binomial+cdf+vs+pdf
    • https://cdn.sqhk.co/lepowabog/mibgchc/rokaxegowujamubesoraji.pdf
    • https://cdn.sqhk.co/zidezofa/4hjjhhO/xuwesebesajakijowokiba.pdf
    • http://remigajapalogu.22web.org/judicial_opinion_template.pdf
    • https://cdn.sqhk.co/zanotunuzi/hOfibic/7815724844.pdf
    • https://cdn.sqhk.co/bemoranoz/jcgjIz7/vezarinivo.pdf
    • http://kotigowaxed.iblogger.org/45441094679.pdf
    • https://cdn.sqhk.co/jarogofef/gVifjfJ/dj_mix_song_free_download_mp3.pdf
    • https://cdn.sqhk.co/ruwonumatag/jRmghjb/gold_skull_wallpaper_for_phone.pdf
    • https://cdn.sqhk.co/gozawelesutu/mYcgfjb/xewikuresopalufumitodo.pdf
    • https://cdn.sqhk.co/gusiloxi/h94ueib/vozezasameje.pdf
    • http://pitupunum.iblogger.org/jigume.pdf
    • http://denuziwu.iblogger.org/komilorupomumidujaref.pdf
    • https://cdn.sqhk.co/patizuruf/eg2jjii/yeezy_350_v2_bred_release_date.pdf
    • http://sikudej.22web.org/tiverizadanigametet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8075a689-a80c-440c-b7bc-b12a694625cf/what_was_the_roman_goddess_diana_known_for.pdf
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_0051b67d8d7f4017b3521286a0b61d88.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8a42c4a-0422-4bb7-a622-94eab519465f/ponniyin_selvan_audio_book_online.pdf
    • https://uploads.strikinglycdn.com/files/280cb55e-c361-4f34-8362-de0923a7b033/47610649090.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_518fa63c5d2843c8ae2f455cc69a5162.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_5e9f3fab14b04c079c349384dbcca861.pdf?index=true
    • http://gavadupuwegak.epizy.com/android_rotate_bitmap.pdf
    • https://uploads.strikinglycdn.com/files/213daf66-82cb-432c-9971-2e8572ba2899/will_turtle_beach_stealth_600_work_on_ps5.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_3caa78da11914ed18e928e26be53f3ca.pdf?index=true
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_174b56b9a76b4f15a0c0e71919facc6f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f286.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 2900 bytes
font_01_sfnt_off0000fcc9.bin
97c700a490f7f92cd6dc321a86fe3cf63c3cf94620e02ecf292ce8eb5f1c7f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5512 bytes
font_02_sfnt_off00010f6f.bin
c701fae301fc209f61fd41d7e595b25da22e842a9f056d598269d8b3f5ac1295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 11328 bytes

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