Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25eec08e158c3e5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 09:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd158c300c14855d60ab72ebeab2923a SHA-1: 6ea542495785aed081c2aea057e96fc9c4766b3d SHA-256: a25eec08e158c3e5b09e8abe1a0176c049d0959b0cb8a9d6fb46c8310d641979
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', directing users to a redirector URL. This pattern is commonly used for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary lure appearing to be related to 'Kindle convert pdf email'. No scripts were extracted, but the structure suggests a malicious document designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=kindle+convert+pdf+email PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5ffb8977b753b.pdfIn PDF document text
    • https://wobubowez.weebly.com/uploads/1/3/4/7/134709338/d0284ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fcdb38009d5d.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/207ed1.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/6559994.pdfIn PDF document text
    • https://lepuxodotedob.weebly.com/uploads/1/3/4/5/134507089/27f666ee110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_602af8ed081be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_6009534be80b8.pdfIn PDF document text
    • https://cdn.sqhk.co/gefeloxo/ffnJiDE/inle_lake_myanmar_wikitravel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5fe54ebb8b0f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe43687a2b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/d3jcugd/good_looking_loser_kratom_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_603f35a7a2f7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_5fe1f87727859.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/35bfd5604990acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_f9c1b51063db4709bcde6741f3502ed2.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_cf62c7800c8f4433b926ee442466f6e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f559b0c9-3b0d-47ff-9806-fa0e6aee39fe/the_lexus_and_the_olive_tree_amazon.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_a5bd9b07a7e24bcbb61a605eec641d5f.pdf?index=trueIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_77664cae22474eb3bf7a10a8951012a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a1f8e1-32aa-4c5a-8dc2-dcbe0bc516e7/le_petit_prince_quote_in_french.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_8140cffec6d54b8a8f24ee5dbbcdc9c4.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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5152 bytes
SHA-256: a0b051faf718c06d1737dca9dea1f63617b8117551e909b88aab09db9e826f3a
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 11484 bytes
SHA-256: 6c8698be2544c3c84b08657815408b5db69a0766b2661a7fd6c70d586d3f3b32

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