Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a52d8e894e2dccd…

MALICIOUS

PDF

99.0 KB Created: 2021-03-23 01:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9da883098ddde9ba7949c6802634d724 SHA-1: b06aafab94a4ffa32267382b0fb8028c5e8432ab SHA-256: 4a52d8e894e2dccdae21d20fe8874994bb707e6c128103bfef3e970babb66519
186 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 0.9989

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=showbox+apk+free+download+iphone PDF link annotation
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/tejuviwimokobir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5fd0a0418758f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_604cf51b110e9.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/pidavom-nutobujak-jodokixirepulid.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/9371772.pdfIn PDF document text
    • https://fojaxifolovu.weebly.com/uploads/1/3/4/4/134497744/fetivasabagisus.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/a41ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_603eadc3d3c39.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/gowinuvugisuwi.pdfIn PDF document text
    • https://lesezisuwo.weebly.com/uploads/1/3/4/1/134109364/kidurubiw_wivepolutaso_wokerexa_fuxetef.pdfIn PDF document text
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/2659774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9e206987-c6a1-4392-8bc1-9bb72b3fd547/jilawagufifixusexomogu.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/17377186356.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_74c7c9bff5be4de2932402ac17983c24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f150be8-a469-493a-8465-58bc282e7875/xulik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b57b36-c8ec-4862-8680-b5ad539e1599/6466444087.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/avid_nexis_e4_installation_guide.pdfIn PDF document text
    • https://5197ab9a-5cbf-4c92-8863-96ce2dfafb62.filesusr.com/ugd/f34823_1009a22286624a14b640278b43593f00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/860121a5-1a75-4f29-a835-54288e65ae90/ripupojabepen.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_3afed0fffaec44dca66cdcad2cb64113.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_d4047a1db3044571be3f607d1c5abe8b.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_212128c9943b48719ecfe4298a660d75.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001404d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1404D 24956 bytes
SHA-256: 3e1f8fe4eb58cb67ba838f2565b5540fb6d4fd31af2ee8521afabc03b3afae75
font_00_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 5128 bytes
SHA-256: 17e61838e2cd72dec60156aa5e021272a0d664fc3e4aa6d7ce388b6bee24fa9c
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 11396 bytes
SHA-256: 2b82c28ccbca51553391c7c18a590de65184d7ffdb026fa4df1f39e623c518d8
font_03_sfnt_off00016d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D6D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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