Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b252607d85c2d…

MALICIOUS

PDF

146.1 KB Created: 2021-03-14 10:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8dee2020d8c1a6ec50b8694f9eed42db SHA-1: ad8410803acd3ff9cd183da1fdebbfd74269bfa4 SHA-256: e16b252607d85c2d15029b4b7333ab196e2819d4de7aa96b2a9adeb0a957e20f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9988

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=rimbaud+les+illuminations+pdf PDF link annotation
    • http://telovajov.medianewsonline.com/how_to_write_a_rebuttal_example.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/wegefegobawegozorilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6013c10f47afe.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/rusuzewew.pdfIn PDF document text
    • http://artdebug.site/pixuderirgaqt.pdfIn PDF document text
    • http://7evenrp.ru/suxanuzebawelobadojitunirv74vy.pdfIn PDF document text
    • http://smm-target.ru/51028520949hlac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_6016e404733ea.pdfIn PDF document text
    • http://tareworig.mywebcommunity.org/allele_specific_pcr_protocol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff651d640690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd112e5d9388.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/albert_einstein_quotes_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5ffb0949902db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/english_speaking_learning_books.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/87217536552.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_1c3c7c7ed55249e9978f6f2d9315e875.pdf?index=trueIn PDF document text
    • http://tumofif.rf.gd/42475624261.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_18fe7c3778934af796c056496a132551.pdf?index=trueIn PDF document text
    • http://menerolefu.rf.gd/48454347437.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_9dbf15ccc97348b2a3e703619e115e3e.pdf?index=trueIn PDF document text
    • http://denakisewir.epizy.com/nenirulesomumaji.pdfIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_ed300505778a4a80aee08981e10f0017.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_4c7d228fdf6244d58d8007de6ac1539d.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/how_to_reset_citizen_eco_drive_chronograph.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_off0001fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD6F 5240 bytes
SHA-256: 9aa2c4d2ca8c1a5aa76e6b049a238cfa8b37ab16dd8410a4bf7b940e99cb850d
font_01_sfnt_off00020f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F2B 13296 bytes
SHA-256: 702ad8d4f37ca92276dbdeba14ccbdc0f4250f80f7e4b5cd13d5cf3f569bd5e1

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