Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5301be2722fae3b…

MALICIOUS

PDF

74.7 KB Created: 2021-05-03 00:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e9bbbc7372d6da527cab780b85e875d SHA-1: b346f2b87edec42ddae104647a614c6e765b8366 SHA-256: d5301be2722fae3bdce6b39af0e2e7e4b55f440b1ee8b851d4b6e7d40bbbd4d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a high likelihood of this document being used for SEO manipulation or to distribute malicious content via a network of linked PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution, potentially through embedded JavaScript. No scripts were extracted from this sample, but the PDF structure itself points to a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nipisod.ru/strik?utm_term=broan+range+hood+light+knob PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/iTgc0ic/92339577962.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/hjfmS7f/deep_sided_single_sheets.pdfIn PDF document text
    • http://magic-spring.com/jopapuvekisupiparo9pbys.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/ie7ggz2/tavijaluxifuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_600ea618565b3.pdfIn PDF document text
    • https://cdn.sqhk.co/vezukefuza/hjjgigm/51860381613.pdfIn PDF document text
    • http://ketotreno.buzz/turnitin_free_download_full_versionfbha8.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/gghhoih/57068892826.pdfIn PDF document text
    • http://bit7.top/pegatron_motherboard_2ac2t1fdz.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/gmijV03/tafivuladejedaruwipokuz.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/h7gj6ie/rovojorenabimowuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fd0738045086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fd31c08b05fd.pdfIn PDF document text
    • http://o-karte-kopilka.com/despicable_me_3_song_free40blo.pdfIn PDF document text
    • http://mbfsopg.com/24155782238o17s7.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/epjigeL/.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://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_2a7bad969121455da70f1829dc93f457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5db419a-fc71-423e-8b41-ff2026801df1/98079378964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15ad1c3-5fb0-40bc-a3fe-326d61c1e50d/27559464055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7411a420-add0-41f0-8495-efd395210f5e/23834976086.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_492674c57a6d4803a2fe6b1276d5256b.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_88eec6c3742e4070a0ae55bd8f8bbdf1.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_7f4ee6e33277480ca1ca18ee6450a55c.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_f1a9ad89ff704063842573c5b61b4a3d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 4952 bytes
SHA-256: 98257c9c1a059c97787d06db912f8da95b81418ebf7d55a2c017885773a06c12
font_01_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 13248 bytes
SHA-256: 5b3abb04b4d1d14864b4c3881369fc024805a7193bef034e332ce15534cc8ae1
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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