Malicious PDF — malware analysis report

Static analysis result for SHA-256 b518b04fd06577db…

MALICIOUS

PDF

81.8 KB Created: 2021-04-24 02:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 70e2bad9e40fb072cb5b6e092f566d8e SHA-1: 1a43361f5c6453f7dea7c6d647c5a0b240585695 SHA-256: b518b04fd06577dba48f57a1f24521a7f5cdd4029839301c5cddce57b93a6c1a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'transition words' and 'paragraphs', suggesting a lure to engage the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=transition+words+for+first+body+paragraphs In PDF document text
    • https://cdn.sqhk.co/juroniwubiji/gjH7Tjc/nccn_guidelines_thyroid_cancer_2018.pdfIn PDF document text
    • http://lnstagram-office.com/pudibaxejijokatuxoyd5xe.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/igNhgDk/kikaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/W3Vhcjc/rusatisumologisiganiroz.pdfIn PDF document text
    • http://neuroncraft.online/68777308114cli3i.pdfIn PDF document text
    • http://shop-you.xyz/hp_officejet_5510_specsv1673.pdfIn PDF document text
    • http://sodaapp.club/739102431837ccpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/samsung_hw-hm45c_check_subwoofer.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/kumpulan_cheat_minecraft_pe_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/luvilasonegudutipatarexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b08b9a0-55bb-4293-a757-040b503062f5/60578218217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7554823a-7be0-415e-904b-27acd8c183bb/24029833120.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_2ae69e9bfc324e10af8ce2e4ecb9c0ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61b81bd-efba-4bb5-b337-f97cbdbc23ce/how_to_change_bulb_in_whirlpool_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/wd_my_cloud_ex2_ultra_set_up.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/likekogume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5139b2b0-4fc0-4b08-b28a-85c6b891c94f/xutikikelijatatuxumipopa.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/glass_imdb_parents_guide.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_93e6945dfd714456af57cac8cd4b04bd.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_3751f0b2ff1040a384030f03f19a7953.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5d0c2e-bc78-492a-9b7b-6d58778d3dd9/31298609498.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 5552 bytes
SHA-256: f1dfce4261eb6204e8faa40ff30ef0f19e855b8194f47e15715e81e5c921126c
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10868 bytes
SHA-256: 419bde3e6032d65c1a1ebd6362343546488edb8314e85ee48e2affb192432f87

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