Malicious PDF — malware analysis report

Static analysis result for SHA-256 00215fb2a757f66c…

MALICIOUS

PDF

102.9 KB Created: 2021-04-13 08:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91b9c9af0d27e3bee737922be7dcd39d SHA-1: 2d3de8ff76a2b870c3bb8630ab15d42f26a98eec SHA-256: 00215fb2a757f66cc2bd2c6bc53344d551cd813dc9bbde4af8f84479ff32cc5d
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm designed to obscure malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to trick users into visiting potentially harmful sites under the guise of free book downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=computer+telugu+books+free+download+pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_60335e98a8242.pdf
    • https://static.s123-cdn-static.com/uploads/4413458/normal_600174d6913db.pdf
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5fcd9d2c33b61.pdf
    • http://appletopshop.ru/726878983151j1fm.pdf
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fd6e4edae02c.pdf
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ffa738a7f01d.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_604549b31e788.pdf
    • http://winoraama.site/22443209076lwk0c.pdf
    • http://leopolds.space/how_to_fix_ryobi_pressure_washer_pump3pn4k.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170a6af3840.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_6023aafbc415f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_10c40baba24540e389815a6d053e9491.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_b126530210e4415892e5debe72703b4d.pdf?index=true
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_e7aabb2faab9484ca3202f8c7d2fd1cf.pdf?index=true
    • https://s3.amazonaws.com/gonafoziguwewe/lg_g2_d802_battery_replacement.pdf
    • https://s3.amazonaws.com/kakekojezutok/kuxaj.pdf
    • https://uploads.strikinglycdn.com/files/d54b65f0-661f-41b6-bbe7-7007067ae747/demostracion_de_identidades_trigonometricas_ejercicios_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/0390639f-f94d-4fbc-ade7-62d6882e24ad/61090571360.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_7a33a35aba6645b8a4ca688089abd4d7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ae5.bin
fab2abda7caabf9ce38d4d11df4988f5bc71073b14a7ff6f7fd5f92cc0cb6eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 5560 bytes
font_01_sfnt_off00012dbe.bin
54e3336b0633196ddfcad564d86c0269f7cddd3050a020e852bbc9ed3d88d8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 8368 bytes
font_02_sfnt_off000145fa.bin
4df92d762c84ecc25bf6a728514c949faeb65b7d2181451e453cc29236587610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 3164 bytes
font_03_sfnt_off00015324.bin
d13ffaeb8f5763a5cf6600177cab714a3bd2ef8d9483cdcaad5e0b76b1f767fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15324 11524 bytes
font_04_sfnt_off00017aa9.bin
c0bb8682340873715e66bcfb9ec4474663dc01b6bd5e27ecd3061885a3b737ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA9 4468 bytes

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