Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc576d4cd6dfc1…

MALICIOUS

PDF

176.6 KB Created: 2021-06-11 15:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ea73353a6316e0f9e500c15b564cecb5 SHA-1: e560e6e0298cb5b7454cd543f0b99d67d29997b6 SHA-256: 73fc576d4cd6dfc18617f7ced0f5781ec9d60ee37e6584c7ca2903684026518e
104 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. It uses an urgency-based lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://synerhu.ru/pbw?utm_term=oh+china+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409623/normal_60401255ce329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_6012d92c88797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_602d0ed65cac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_60468201499bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fecf5c236a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6029addb40e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_60475b2400825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fcc9901d232a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_5fd91c44369d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_600ddb0b056b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc677bb89713.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_5fdd34795a764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fc9c449d91c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/piano_tiles_2_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28e0c0a-508b-4744-a94a-0adec08eb8ed/bufatogamadonuja.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/vubabazijokotijekoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46e3583-3004-4d22-a94d-a8515cb2ab3b/what_is_velocity_chart_in_jira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04798c99-ffbe-4417-95f9-622b8d6e1341/dabirufefivasamoxipinipuz.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/misezutawir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00029948.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29948 17580 bytes
SHA-256: efa97d2462586936e82fd02e0b3c59d1f00bf2622016e96ba1c3840a16b65fa6
font_00_sfnt_off0001f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F508 20992 bytes
SHA-256: d29ea94b28be18284b5c92185630ba49f094c7a9fc966753a3ee62732f6654d8
font_01_sfnt_off00023814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23814 5236 bytes
SHA-256: ee3f25341010fa2e9337a16d398b85b6b0526a723a92fd178942baafa3fbcef5
font_02_sfnt_off000249dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249DC 5812 bytes
SHA-256: acd9abe36e4ddf506b3cdda254529c3e82fde0706dea23a2d4078e32bd76a8fc
font_03_sfnt_off00025875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25875 23420 bytes
SHA-256: 3b0f94ce51d041394edc6f754fceaad951a2f8283991151d264b0330a81c6ff6

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