Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c2d36d3abd27ff…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 02:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a88f224ae5152f4f7c6a1fff5b3ea1c5 SHA-1: 65af1768b26bdf87df8c02185695be1b96ffa2ed SHA-256: 28c2d36d3abd27ff724ac335888ed2da591ce42c0f89ce34f229335759046a0b
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong attempt to direct users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=camadas+da+atmosfera+terrestre+pdf In PDF document text
    • http://biomanua.website/free_printable_feelings_and_emotions_flashcards907so.pdfIn PDF document text
    • http://metaleagle.ru/evenflo_tribute_lx_convertible_car_seat_jupiter3zcwh.pdfIn PDF document text
    • http://nedabemimekoz.iblogger.org/novojafojokesawufupute.pdfIn PDF document text
    • http://jibitivi.66ghz.com/f_4558_ic_datasheet.pdfIn PDF document text
    • http://gbo.guru/tuxinupunonekupoguwokchbg.pdfIn PDF document text
    • http://airet.space/subway_menu_price_canadaclt0u.pdfIn PDF document text
    • http://lefakumal.iblogger.org/29986332387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konivad.epizy.com/xopijosadezelutivekun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e2c797-0d3d-4f27-9a25-50a660fb8864/20858219060.pdfIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_d1e3e9317d0c4b00914e3bc14df45426.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/6th_grade_comprehension_worksheets.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_0961335a696045349d54bbc81953ae71.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_d1877a1134aa43be8aade2620728c5a1.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_ef682697e07e4ece8b0150a152a32fc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ddf445-0448-4c18-add1-eda1cf2f7b63/2007_ford_mustang_gt_premium_convertible_for_sale.pdfIn PDF document text
    • http://vanuzavabew.epizy.com/56126525269.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/14750737245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8e68cb-a939-4436-a7c6-25131011ca1a/does_target_have_sodastream_refills.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_0daddf6076fc4ce29bf389b8afece128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/keretosug.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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 5060 bytes
SHA-256: 772aa965f849feb40fa748cca35d744b5bebfa313b913fcadf9fbe7c61ec562a
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 13552 bytes
SHA-256: 208a6adfd4880f9f2fa53e6d2cfb803371a0a2687183553ef5b7ff55e4423b7f

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