Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16965e5dadb99a0…

MALICIOUS

PDF

77.8 KB Created: 2020-12-18 03:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db5e95bffabdded2d3af93030fc57ec8 SHA-1: e6549171354dcc96e9f1b59b411bce2b9828245f SHA-256: a16965e5dadb99a0f14358d5fa82fd976e7de08eee9e813d2d3584281a701229
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=dark+souls+remastered+save+editor+switch In PDF document text
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/pivexakajox_fipodufadilap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f89e6de815ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66e366ef4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd878bc-0783-4e8d-9077-742d830ee67b/prana_mens_shorts_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6f350f9cd615d7ca4cfd5/t/5fd5fb875b1f6f7539cc70b0/1607859079640/fall_of_rome_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc295c5a5bc066edfb0618a/t/5fc65032145a8629dc8892fd/1606832181061/murder_hornet_nest_washington.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41011cb4-f9fa-491f-be5a-9e6a15b1dfe9/libra_of_the_vampire_princess_uncensored.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/audiobooks_audible_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57982a879396864270a01/t/5fc9752c8c8de9706822f251/1607038252988/xizajisoruxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5abaf0-61e0-4258-ab0b-6faa23c92af7/principles_of_seed_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91d5288-072c-4992-98dd-4b0e0cb91097/15875579089.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15e0c3dfdd95b60d85a11/t/5fcd54592fa8bc6bcdf9a6b4/1607291995183/tixuxepatopegeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc302ce16f6d44b07cc72db/t/5fcc7fa574a40730fb92b3a8/1607237542140/98877909233.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcea2efb44223045ec8676c/t/5fd0bbd75c296e7a687bded0/1607515095935/knife_battle_apk_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 5576 bytes
SHA-256: 9f50d5f6eb55f3478430e9e540f1f170e5085f8f7b2d912675f569a2e5ef643f
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 5392 bytes
SHA-256: 1fa0e25212d69975299d824fe4e59460f381b7dec6cdf5dbba7d27b71b79e283
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 11708 bytes
SHA-256: bc2d38877e7189b198d135d1712c48748bd828085699d778c193dffd38148b6d

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