Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3b3bc105f66fa4…

MALICIOUS

PDF

78.7 KB Created: 2021-04-03 23:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8181be2648d22031aa2870dd390f32d SHA-1: 71003b923d8feec05041a99be9c4893a9a9ed401 SHA-256: 5e3b3bc105f66fa4d8eda84716b426091b4e49efd3d3de7e2dcba6fa74e75c5b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Gi perforated sheet weight calculation', likely intended to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=gi+perforated+sheet+weight+calculation
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6019264af1d85.pdf
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/ebb82478c2.pdf
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/2664285.pdf
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/2193373.pdf
    • http://rixegubinufu.iblogger.org/75534000203.pdf
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/97ea61d46c276c.pdf
    • https://cdn-cms.f-static.net/uploads/4456989/normal_5fd947afcccd8.pdf
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/jifowidopoda.pdf
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/malopinaxasusazovila.pdf
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5feb5f5ee0b50.pdf
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/1cbfaecb1806d1f.pdf
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/kawuboruvuxadimitub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molexilijiji.rf.gd/12320833571.pdf
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_817e968e66114a9a81bedb7bbc1faee0.pdf?index=true
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_e561ef91623943e48b0a9efc886a5ae5.pdf?index=true
    • http://tifojuluguzix.epizy.com/somewhere_west_side_story.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_ba5cbf949dca490cafa7f30aa8bc465e.pdf?index=true
    • http://mutizurik.rf.gd/bexolamakixuzodijafixi.pdf
    • http://xadoteditopuse.epizy.com/prefixes_and_suffixes_words_list.pdf
    • https://c906085e-155d-420a-9284-418053e299e9.filesusr.com/ugd/12745a_6c4b2552f8624c93b2b9fc274f016ba4.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_d0d343b594d44f4ab29746146a78fd05.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7cd.bin
57b495c1d9799612bf6309350a4bdbbb580111f30525342f4019bc4fa42e9d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 5540 bytes
font_01_sfnt_off00010ab8.bin
1ec9bded5f9a2ac98962f2e632729d2424b50e8ffe0a3368e9ad7eb234154c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10152 bytes

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