Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc827acce8a060c…

MALICIOUS

PDF

131.0 KB Created: 2021-04-07 13:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ece9d48338d71781abd6a47f50a7c7 SHA-1: 4ec2141ce52b7b1c603f1b6c07854225c95ca1b8 SHA-256: ddc827acce8a060c58457c62d7cd84e8eb4669496002252c0f386f321e13954f
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of hiding malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/wix?keyword=2004+ap+chemistry+multiple+choice+answers
    • https://static.s123-cdn-static.com/uploads/4378855/normal_5ffb339861abe.pdf
    • http://zuxekagapefe.mygamesonline.org/abdul_kalam_quotes_in_tamil.pdf
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/ab26efc42.pdf
    • http://wurikiwerofa.getenjoyment.net/apollo_munich_network_hospitals_list.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/b2e30.pdf
    • https://cdn-cms.f-static.net/uploads/4414357/normal_600c623c444dd.pdf
    • https://cdn-cms.f-static.net/uploads/4422163/normal_6029a85c28263.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_602598927a58f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusixa/enlace_ionico_ejercicios_resueltos.pdf
    • https://s3.amazonaws.com/xonobijikivo/59556770637.pdf
    • https://s3.amazonaws.com/wujafivabipo/nursing_diagnosis_handbook_12th_edition_paperback.pdf
    • https://s3.amazonaws.com/supefujoxopubu/vadunu.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_7c1a63f4b253428a8c09f6996e9c771a.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_d9b01f3e2b704a8d994723e7575a17e3.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_6abb92922ddd419f819bb07cf608c6db.pdf?index=true
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_02ae741730244ed08b8dc38d6eea35b7.pdf?index=true
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_827671eb4fb8429a9711ad142d0a938a.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c593c916bfaa44b997301cf9cb4ffbb8.pdf?index=true
    • https://s3.amazonaws.com/tutapaxi/online_android_games_with_controller_support.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_50ec68c37bed4d73a032cb883b3b9939.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a125.bin
9d027c3a64c4f98b830c049cdc9e30a39ec555ec1a0836685657d99a656c8b54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A125 5636 bytes
font_01_sfnt_off0001b432.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B432 1800 bytes
font_02_sfnt_off0001bcc0.bin
18c9fb938d924f42978a220ed0914f007d72bd21d7d49800329b9381dbb9b62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC0 12992 bytes
font_03_sfnt_off0001e89f.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E89F 16036 bytes

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