Malicious PDF — malware analysis report

Static analysis result for SHA-256 7759f04ded22b64f…

MALICIOUS

PDF

80.5 KB Created: 2021-04-05 23:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 457c1ae316f99ac990194d32c1d8a755 SHA-1: e70b89d90e655851cc2e4fbf7c3b4ae694051a61 SHA-256: 7759f04ded22b64f1e4c8127ecc2b57ae5c669622b23364cebdd753e656b3625
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm or SEO spam campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=boston+market+mac+and+cheese+price In PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/vugan_fuvumomasusijov_xulenazabola_tasiragopid.pdfIn PDF document text
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/7355613.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/irregular_verbs_list_english_frenchy5ius.pdfIn PDF document text
    • http://quickstore.pro/9074983331tgjqt.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/vomukope.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/b._d_singh_biotechnology_book_download.pdfIn PDF document text
    • http://goldstein.berlin/bilugekigegeraxanog3m.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/wuxupewu/bose_companion_2_series_1_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/kitchenaid_superba_refrigerator_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/46118338593.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/totowemopol.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/14623952714.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/chess_tactics_and_strategy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/6550149233.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/ribenelized.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/how_do_you_use_a_breville_slow_cooker.pdfIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_be9d4dc7b78a4006a87ec50fe0e925da.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_5f1fe562903b42c184d3a4a031da9832.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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 5392 bytes
SHA-256: eaa09fb6bd1c449a9fa307629408fe7dbcd1ecd6dbc16604491c436ecfe9360a
font_01_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 11564 bytes
SHA-256: 1186c6c89605bca7ebdbd4bb9f0b9c037b57da7257a08c23ff3fab17b5b6d273

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