Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c15723a3323ae8b…

MALICIOUS

PDF

91.5 KB Created: 2021-03-10 08:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d44d71504891f730d69274ef4cf20d5 SHA-1: 9095f86173a67c9556df09d2c7059e7ac7c0a2c1 SHA-256: 2c15723a3323ae8b08ea84e261d2570a08e2fcb1a05902d316146ef631927cba
156 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 0.9967

Heuristics 5

  • 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.
  • 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/123?utm_term=balthasar+gelt+guide PDF link annotation
    • http://pamuvelap.22web.org/bosutukejelatofezaleweg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_60050169d7c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_6018a30b821ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60214a0d5fd21.pdfIn PDF document text
    • http://zuvoxikoxeseko.22web.org/99252541707.pdfIn PDF document text
    • http://kaxasujigunabew.iblogger.org/89760345562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5ffa8e030561d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fd66582e2309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/free_christmas_sheet_music_for_handbells.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_caae8953fa6f47fa9a5dadbf25c58383.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_7539025604054b22956cf1788f32e5cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/xoruxolixuvizipefepugake.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/injury_report_rams_vs_steelers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/what_does_intercessory_mean_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/morfologi_carica_papaya.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/23748855946.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/nalezog.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/58491827559.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_3ee76ae6b59342cfae8e1a21114d7fe0.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_ae8a7e4aa96d489a979a7f13fd657b45.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_9519f43abf1140f481e863055407fc7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nexej.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_4a8239828689437c99ad13f4c5eebae4.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_fa61dafd3a8c4d4cba309971869fbeec.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_cc80559f4ad14278999579068211350c.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_32feeb1cff3c4ed9a226a3b7cf03f1aa.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_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 5136 bytes
SHA-256: c7144c4af1db07ce73c584854d6665c993721918298bc216a4b086bdff3378ec
font_01_sfnt_off00013bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC8 10768 bytes
SHA-256: cbe8b31f0f2de2f423a1ceeed336e321dcc05ba5ff93f99cf0f27740eda2c9a3

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