Malicious PDF — malware analysis report

Static analysis result for SHA-256 987715b3e2821dc1…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 17:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2fe717f1126f21e3ab73bbfb285ec301 SHA-1: 9e1ba5dc89e49a117ddaafed8c60c8e616f2f184 SHA-256: 987715b3e2821dc1a5293d8f83ec7346c0c044a4b8d29aa1d9195ec104e46570
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 0.9996

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://druttle.ru/strik?utm_term=moultrie+a-20+troubleshooting PDF link annotation
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/1307539.pdfIn PDF document text
    • http://lightstart.xyz/xikuvofudedemirukolzjmqd.pdfIn PDF document text
    • http://justamorem.com/5248059496373wsi.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/togedag_ludavozenojowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5ffe937ff285a.pdfIn PDF document text
    • http://sokfresh.fun/39581393213y28l6.pdfIn PDF document text
    • http://mastericy-chistoty.ru/52366408834y3ib4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_603c1832bb386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_60068e9ccb36a.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/2501734.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/9835195.pdfIn PDF document text
    • https://nupoxomet.weebly.com/uploads/1/3/4/3/134312810/545038.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/0a9b30c8-62b4-40d1-bc08-51124475ae75/60330293375.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_dda38ed8e40a41eda0bb403191708e6f.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_d5dcb761285643f9bbb2a6b35205e191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/mixujanezomuzabuzolutota.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/88205198339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e17b4c-afe1-4b19-8752-88cecc6d07dd/chinese_text_to_english_translation.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_77282727cf984fba8ddfe08fa64d54ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/27902128310.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/44152445540.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/68783039473.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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 5400 bytes
SHA-256: c49e34f6a23e3a6be177313d714a8e7e1ad1d4aacbf9c2ed45538f70978c5ffd
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 10020 bytes
SHA-256: ab93b637c8636114a4daa1b9787e2dba0ad315a91625dd10a9dc630f803306b7

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