Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc77fdf1c3a8728c…

MALICIOUS

PDF

78.7 KB Created: 2021-05-23 22:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f278bc8c08543ac172df99546c8acb8 SHA-1: c638bd00636e44e0ae630496e5c7b5221dbf0f50 SHA-256: cc77fdf1c3a8728c6a83ea779dd7f8c9575a1729d690bd24373e1038d290dee7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/strik?utm_term=the+sixties+the+space+race+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fd94697cd296.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/f7fb252d.pdfIn PDF document text
    • https://wilewefat.weebly.com/uploads/1/3/4/2/134234777/vazumur.pdfIn PDF document text
    • https://welogodeketi.weebly.com/uploads/1/3/5/3/135326703/3576638.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/3248088.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/6515634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_6047d5210b9d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6303b68f-a102-4bfa-a839-1bf4dc08595f/nisuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/yuntab_tablet_e706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bed7917-d139-42b3-9f29-845181ff7fd8/97954366776.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/risuvakibugufake.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/elder_scrolls_1_arena_remake.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/bharatanatyam_tamil_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fd8d45-2bc7-4955-9c44-b4307182a846/side_by_side_1000_honda.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/mudud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3be9af-1ca1-4bc7-a629-64808655a299/how_to_set_clock_on_westinghouse_oven_616.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/lujimonukodo.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/act_prep_black_book_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/pedazomozu.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5160 bytes
SHA-256: 8d5f2f3c57265894379445b3fa3d626a9f221f54e76876ce3c1cc4965edc9d17
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10696 bytes
SHA-256: 9ea14e51318ea77c171d37579780caf56818121967b7d058f1a4b00a410a07e5

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