Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bbb402ab77dadb…

MALICIOUS

PDF

81.9 KB Created: 2021-02-19 04:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e1c19402a1e0983fdb338670c8475c66 SHA-1: aafd768877e5953388c1adc86f5b75f7ffde71f8 SHA-256: 05bbb402ab77dadbd0dde16711e1b8969fc9afd4feea556de1d1c2f9691966ae
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious workflow, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+repair+a+leaking+hot+tub+jet PDF link annotation
    • https://cdn.sqhk.co/lakodatoli/NgfgcHI/40090816985.pdfIn PDF document text
    • http://sadovik.me/audi_a4_b6_avant_trunk_sizeit5sp.pdfIn PDF document text
    • http://portkamesto.site/adobe_acrobat_reader_dc_continuous41c4f.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/hdjfAfA/subway_princess_runner_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/tFibcjb/stickman_simulator_battle_of_warriors_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fcf8cb71b416.pdfIn PDF document text
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/89dc0a.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/9dcbee0cd.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/sakitelefe-gewuwip-nisigixu.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hihghhI/69528938716.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/2452801.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/75f1ba20d9ce7d4.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/bTWMhbI/luxy_poker_online_texas_holdem_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ON6thaO/bujifivezijupo.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/sisimediwuluru.pdfIn PDF document text
    • http://ch-redirect.icu/how_to_calculate_strength_of_wood7mx26.pdfIn PDF document text
    • http://rodsfish.club/96971499434o0u6k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 5236 bytes
SHA-256: e683f07da21a97d95d8cf624de443999c70686611ccf6992f3284a2d3d418e50
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 2932 bytes
SHA-256: 7c06536ddc40e81be51f90e78fe63b54cf1c7b6468e7d21f5d34bd9410830430
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 12244 bytes
SHA-256: 87004f21f270538e0128c6917149609e5d8b466086d3b28bb6dfbdec2808f26d

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