Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb069c1abf9a788…

MALICIOUS

PDF

72.5 KB Created: 2021-03-15 11:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6a98cee7e3ee8ffc249f5345a66909c4 SHA-1: 5f3cdca751b8f6186e18aebf1c6c43122c4d2ea2 SHA-256: 3bb069c1abf9a788471c65ca63b9c1d2c9103c6996db03f8c7bb879746516d0e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=shaded+cream+mini+dachshund PDF link annotation
    • http://pegejoruvufiron.sportsontheweb.net/developmentally_appropriate_curriculum_best_practices_in_early_childhood_education.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/buzudime_pepawanukux_mebikojevefu_dubujavu.pdfIn PDF document text
    • http://manovina.mypressonline.com/91881629337.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/93325319412.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/potukafav-jififasaw.pdfIn PDF document text
    • https://zagumugapepari.weebly.com/uploads/1/3/1/6/131636872/d7ddd2924d8c49.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/287580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_5fd048fde12e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_60119892cf545.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/00a80b2.pdfIn PDF document text
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/57f00c030d5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fe9496bbe2d7.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/4cddfa45ece235a.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/acc5d5c01ed5e34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dugafoto.epizy.com/jijizorukokaguzo.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_5f2dccb34d0241a79307601d2b3b53a4.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_65490e8d1e7a4bafb770d4fd7592dc0a.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_f64851e549464f649e5f54f47a499d57.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_87b3a33a655342b48d3fa0ab657e91de.pdf?index=trueIn PDF document text
    • http://valolezame.epizy.com/precision_garage_door_opener.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_e17b4a2a0ec14cfb965078e8040ccd3a.pdf?index=trueIn 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5248 bytes
SHA-256: f1766b5f6adae0c414a5712426a79493a6733dfde4861ac31e1e9fad92a56cde
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10492 bytes
SHA-256: cf95b16761123cf8ee0b3c38bbe3db95dc457863e49d2dbd112f76e6f046c64b