Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82319baad2e1f19…

MALICIOUS

PDF

95.6 KB Created: 2021-04-29 17:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: edc3adb71d400661a353591422cd4aaa SHA-1: 214ff838492dd95bef16fbcca1292c97ba2e7f40 SHA-256: a82319baad2e1f194c5c74eee8b23787fe5b689f7718605e9250ab6fc0dd8074
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 one critical heuristic identifying it as a PDF link farm and another flagging a link to known malicious redirector infrastructure. The ML classifier and ClamAV also strongly indicate maliciousness. The embedded links likely serve to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=what+is+a+children%2527s+graphic+novel In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_602bdcb3a6bdf.pdfIn PDF document text
    • http://tonorubur.22web.org/xakasogure.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/bromelin_spray_bula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415045/normal_60069002593fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5ffc16f7c4514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc8b3abe3e96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fcf469a7b93b.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/bitsat_sample_paper_free_download.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/15153834083.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/xarojapi/commandos_2_game_setup.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_c65f2e43dbe543749158114153474860.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/what_are_the_7_wisdom_books_of_the_bible.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_5365b43429914cdd8751011a57953410.pdf?index=trueIn PDF document text
    • http://bopunuzas.rf.gd/gebuwizowajusazupebuge.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_68f99b74b3a945c583bfa2303db11b2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/brain_mri_images.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_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 5440 bytes
SHA-256: dafbd1859c8e480d46965dcca3ae8446055f0d097abba5be8c8e41b37e7c8d25
font_01_sfnt_off000149a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A7 11652 bytes
SHA-256: 2377ef7adc2e6beaa29e8e58a26e443f9ff4cc082289d66aa2cd82cde09ef606

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