Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b7ca2d88855cf…

MALICIOUS

PDF

72.4 KB Created: 2021-03-30 23:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5eeea31bbd3f6e7bbc1511778d7f4990 SHA-1: 22bdcd8bfc6fadafbc29aa0792bd04c14567572e SHA-256: ca4b7ca2d88855cfd4c4a0b1831a38fc6c82199baac85a5ac311ff872b616e9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF document contains a large number of external URIs, many hosted on disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

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
  • 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.
  • 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://xajibur.ru/wix?keyword=floppy+cube+algorithms PDF link annotation
    • http://gamonigujubi.22web.org/celine_dion_ashes_sheet_music_free.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/50577334532.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/pgdkuKd/query_to_find_dependent_objects_in_sql_server.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/cghwlxz/30863954459.pdfIn PDF document text
    • http://eduha.online/42091624737vlgn5.pdfIn PDF document text
    • http://pexukakadom.22web.org/85277687233.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/ChaLQgc/dotevebevosokotebem.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/d7wVhkJ/minecraft_bedwars_map_download_1._8.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/R2ed7MQ/fepuxumas.pdfIn PDF document text
    • http://dujerewogirovok.22web.org/1000_books_to_read_before_you_die.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/30737233427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_22918170a2d646a1ac85605a6c31efd0.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_3af34e0a67fc4e8d90d3b4d156f7ef77.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/nogamekuzoxenuga.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_0216671d6bb04913a9ae03f6e0daa8df.pdf?index=trueIn PDF document text
    • http://varowok.epizy.com/congruent_triangles_word_problems_worksheet.pdfIn PDF document text
    • http://nubimopupugu.rf.gd/61003214522.pdfIn PDF document text
    • http://gegokuberil.rf.gd/ranalip.pdfIn PDF document text
    • http://xejidomu.rf.gd/anselm_grun_knjige.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_f4f0542a05294d879d8f0cc49e5da166.pdf?index=trueIn 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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 5544 bytes
SHA-256: 2fc7b1a46de4905bafafeb4eb613eca38bbf63ee243ffd2fa85bc28485d4af27
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 10828 bytes
SHA-256: bd30a94f7b4c928ee1af1f87edba32bae21e1db19879aa0d4cb08337a7b50ac5

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