Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba49c9704c7141c9…

MALICIOUS

PDF

90.2 KB Created: 2021-03-10 21:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 64da0d8e2b77d831be2fcec94a74e25f SHA-1: d5870be396edbd743c547a9cd021f4956c467b86 SHA-256: ba49c9704c7141c9f53967927836ad6c599999a1a9de5d3a4eb04067714d7cba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though corrupted, suggests a lure related to rental contracts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zajinet.ru/aws?utm_term=contrato+de+arrendamiento+para+casa+habitacion+gratis PDF link annotation
    • http://aycotoro6.xyz/najapojojijizalknb6q.pdfIn PDF document text
    • http://mscgis.net/zaletowelofajm1i6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5feca005458d6.pdfIn PDF document text
    • https://mufabevazom.weebly.com/uploads/1/3/1/3/131382955/gipubiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417403/normal_5fdc4ef625d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a12534773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_6014baa61af20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6011e0209e65e.pdfIn PDF document text
    • http://wdd13.ru/minecraft_thutcore_5.21.0ucxwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_60372a9d591ab.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/12fb51e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6031430666a5f.pdfIn PDF document text
    • http://stepka2016.xyz/shakespeare_how_many_plays_sonnets_and_poemsyumc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60337110d740f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe5dadce96d1.pdfIn PDF document text
    • http://static-start.top/mogezudiziwijxga12.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/musemoritetuno-naboki-nivobadubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_60347f7e107be.pdfIn PDF document text
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/1157936.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/6719819.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/subopukomanaw/zinodas.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/ffxiv_armorer_leve_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/64725365097.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/what_do_alpha_dog_means.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/48682882295.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 5500 bytes
SHA-256: 8e3b2bf4bc0dadabbf0b0f6c6ef1c02930780fd50ba4fe4baa30dde50b6448d1
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 3208 bytes
SHA-256: b2e2ae06a372075f26c39afc3742ff769753e65cc901503c35a6650fc4773382
font_03_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 11744 bytes
SHA-256: 4532716eb922b87b1af61cff687a0024c10d35202131bb643de16cf502ddce9e
font_04_sfnt_off0001440d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440D 16260 bytes
SHA-256: 5551cc36e751210d452f97153ecfdc3e5378bc532dcb302d41b164c7acf2565f

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