Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d53fd686df71e57…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 22:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14774278e0b1b285919a05278778164f SHA-1: 27378340f4611500fe17082b59a8ff33554a6623 SHA-256: 9d53fd686df71e57955b58bb3c54df607a084b5fc637cdd5eb5c2fcd760f6782
266 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of heuristics like 'SE_PAYMENT_REDIRECT_LURE' and 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's content is designed to trick users into performing actions that lead to financial fraud or the execution of further malware. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • 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://xajibur.ru/wix?keyword=internet+gratis+apk+android PDF link annotation
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/989615.pdfIn PDF document text
    • https://tewodofupizalo.weebly.com/uploads/1/3/1/4/131452753/wumeg.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/53747393619.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/6983851.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/47981569533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_6043f9e752b6e.pdfIn PDF document text
    • http://nesobaka9.xyz/what_does_to_catch_up_mean_in_spanish7euwv.pdfIn PDF document text
    • http://iranianvc.com/nobowumupetewudinozar7l03r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_602c32c16c060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_ab85c60fccc141d5a4c7208670036a67.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_c7e85e863f194170ab57718abb00c7a0.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_38bd7254b2214545bbfd2ff88f761f71.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_8cf792485c334759b851c1339956f99f.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_2c3bf56bd1f3445db279ac56c69a9266.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_53d18b1809314e45acb3953da51bd949.pdf?index=trueIn PDF document text
    • http://gogujigasad.onlinewebshop.net/37764715123.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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 4884 bytes
SHA-256: f005cd7043afda314d63ed0235af8d12dca56d473b6fac5ea00bd3caf370e5f9
font_01_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 11776 bytes
SHA-256: 55bb509f5957b1cc3244f7785cb9e0d79877658909695c771cb7cb99ddf50e05
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71