Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3cc81febfe7aae…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 12:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e939f04ebaa820a1b2c00cd9ff649350 SHA-1: d6f857c0aed104657767239c7e22b60d594eac83 SHA-256: ef3cc81febfe7aaef8ae906779e4d39d9de44f0e8050a573ea279e09c5b56ed8
186 Risk Score

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=cpm+course+3+chapter+9+answer+key PDF link annotation
    • https://folowobudeguw.weebly.com/uploads/1/3/6/0/136051819/tagot.pdfIn PDF document text
    • http://zosoxefu.22web.org/how_to_relieve_bloat_from_overeating.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/because_of_miss_bridgerton_julia_quinn.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/what_is_the_difference_between_nespresso_creatista_and_creatista_plus.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/461569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://torifutipu.epizy.com/belajar_jawi_kanak_kanak.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/mesetajifodo.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_6816f798ae664e6a95d6ee75591f9d8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/cisco_jabber_for_mac_12._6.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_89c4bc66c10e463a8ac5f8ef66a72653.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_4878a49e9a434662b9e4df9e364a6dc0.pdf?index=trueIn PDF document text
    • http://xavumefutej.rf.gd/pablo_neruda_poem_poetry_in_malayalam.pdfIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_8ed11b6b1e324644838903d1f8be5a79.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_95444f7d16d8486db0f1e0bad0d92ee4.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_b6cccd34772b4ab29ce804852d856ce5.pdf?index=trueIn PDF document text
    • http://sifebitufol.onlinewebshop.net/ximebubivopuxo.pdfIn PDF document text
    • http://nijibibikij.rf.gd/tailoring_leveling_guide_wow_classic.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_ecd4ea15f36c46d687d307a1c679422f.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_a8d2c1365e644454b5532b5c1bc58b12.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_94659ba087d14ddea84f0aafa29f5a8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/64270449652.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_d9fdf8b515d142f5a3592d012fb7d7ac.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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5624 bytes
SHA-256: 6385323506405f2e74a3bc80ba0159a23c9d932bfa603e270d72df005693a739
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10984 bytes
SHA-256: d09677c925fecb1fbba05ed8e1c58834db4326a177d44999a65827e32ddecc9e

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