Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0409b3a37068757…

MALICIOUS

PDF

66.9 KB Created: 2021-03-18 18:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adddfdbae944925f55b878492970713e SHA-1: 7d6555fbf4f6d31dd97a33d003310208beaffc9d SHA-256: b0409b3a3706875780767e0f090e70b9c0d64fc677c3360d3e678f80d1b9337d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains commonly associated with SEO link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://dugedepap.ru/wix?keyword=ad%2526d+monster+manual+1977+pdf
    • https://cdn-cms.f-static.net/uploads/4405902/normal_6014b6d59b1e6.pdf
    • http://solent.bar/735725903490fusa.pdf
    • http://vipimuxatomefi.medianewsonline.com/adrenalina_injetvel_bula.pdf
    • http://nodefiw.medianewsonline.com/22337345876.pdf
    • http://tomokatixo.mygamesonline.org/peg_perego_john_deere_tractor_problems.pdf
    • http://nesakud.mypressonline.com/ielts_reading_simon.pdf
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ffbbb7969c4b.pdf
    • http://brumbum6.xyz/miter_box_reviewsrtl3z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cd4d509e-2b6c-44bb-9fb2-2e60727b1683/47119542788.pdf
    • https://uploads.strikinglycdn.com/files/74d40e9f-d3a4-41c6-8cfd-0596a5f5ce0f/sosok.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_c7bae231a87241c7ae4717ddda3fdd9e.pdf?index=true
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_345cb9f3967446f39bfb5588736dc5f3.pdf?index=true
    • http://nanaxidimidi.atwebpages.com/fuwud.pdf
    • https://uploads.strikinglycdn.com/files/9a7d2f3a-c8a8-4310-a891-38fa09628f1f/nodamobi.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_2c795976a66e41c9a8b837f92ec33161.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4870ca93-3299-43cb-beb3-1535cd298e1e/79034262793.pdf
    • https://uploads.strikinglycdn.com/files/9ae694f4-aca8-44fe-bd08-fcb2c3ea7e1d/interpersonal_communication_theories.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba3.bin
46d20c41f0c089eeb09f11eafec75589729f2e07bd3ac45bd87f17627ead244c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 4288 bytes
font_01_sfnt_off0000da3c.bin
7c304f5ac0f5a7e6d507f707f97629c340473a7ea6d6093a9de7b1b1a71dda16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10796 bytes

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