Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ed7fd38a3b3e86…

MALICIOUS

PDF

81.1 KB Created: 2021-05-21 07:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f1766f15b5264affaa1d9740d4507cb9 SHA-1: 2b8bdcfdb0bdd9d60dc33b05280c91d4935494fd SHA-256: 58ed7fd38a3b3e86858c4c059815358c7a212ccd5f3e2420ba72480d44914015
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDFs hosted on cdn-cms.f-static.net, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of PRC/3D content and duplicate object bodies are common obfuscation techniques in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=system+of+linear+equations+word+problems+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407989/normal_604a0fccef877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5fd388b45191c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_606c41e7112c9.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/ramawejibugolex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_60504c4135767.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/53d953d33cb.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/kufuviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_6030304c09ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_602af5f966b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6046a50c93c25.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/xezefisavugu.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/bd20bb1a84d3.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/pakugenorepesov_xowodajadudiba_totaxa_bagutelulivarup.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/fuzafuzeruwit/all_in_one_toolbox_apk_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/19452884224.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/characteristics_of_good_information_appropriateness.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/sagikimididejusatatofo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/2580129878.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/algebra_2_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/mimowobugigizexabo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/34607190396.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/54706581672.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/call_of_duty_cold_war_ps4_price.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 4676 bytes
SHA-256: 91b2c4112819fe5b774a0b503bfec21d5857a8290af6794a1cbfbc00909da8d2
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 5752 bytes
SHA-256: ed6bb1c80b9d504c650d8a4d33e3a5a522e39b857278f9c4b44569de8eb7344e
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 11624 bytes
SHA-256: 140af3a2789cc86058809f1f5c5cf4158b5778f0714505aff363591a368e7d06

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