Malicious PDF — malware analysis report

Static analysis result for SHA-256 021e7cd4e718240c…

MALICIOUS

PDF

80.8 KB Created: 2021-05-24 08:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ad06b1f39d369183ee064a962687d45 SHA-1: 711324e696757715a33a4c8193671f543a1208ae SHA-256: 021e7cd4e718240c6719fec521ee798f49a7a0017507ad60c8bd4f195df2db21
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML and ClamAV detections strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains keywords related to 'brain teasers' and 'adults', aligning with a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://vilenefex.ru/strik?utm_term=free+printable+brain+teasers+for+adults+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417429/normal_602936e7aa3a7.pdfIn PDF document text
    • https://fitovixuzo.weebly.com/uploads/1/3/1/3/131380078/zumajanodow_naxumiroleni_wobuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5fc7a3604813b.pdfIn PDF document text
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/kenagunezado_tovezudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_60148f13922bb.pdfIn PDF document text
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/moruronakoregi-zimagile.pdfIn PDF document text
    • https://juzofejojakowam.weebly.com/uploads/1/3/4/1/134131318/jaxoxavisu.pdfIn PDF document text
    • https://biwusegunaji.weebly.com/uploads/1/3/4/0/134096831/pakuvujunewu.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/kolovuj.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/6512542.pdfIn PDF document text
    • https://gavabukif.weebly.com/uploads/1/3/4/6/134614168/3139661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_60482e53390c9.pdfIn PDF document text
    • https://volatofe.weebly.com/uploads/1/3/4/4/134442598/fulotojewemalavuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_6025c13062777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c18ea9-1556-469e-80ae-0292f727a2ef/98533459763.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/7804516505.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/carbs_in_taco_bell_cheddar_chalupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98d68d9-9d95-42a1-ae59-be587df3d0c0/fuzabuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a7b44a-45bc-47ab-b64c-eb2e60f37cab/robivalusanenujeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb48f08-261e-4113-a213-9f345a8c75aa/shimano_di2_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d42659-0ee9-4798-a418-3b78048bc608/30947366596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7878a7-7c57-41ff-9801-a9bd3238ac2b/watchman_nee_the_spiritual_man_free.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_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 5316 bytes
SHA-256: c55d9cc183101775b5ebfb2d11b328c76572d9115bf1ccdd689dfd6b494828fa
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 10832 bytes
SHA-256: 541be0884bd1626342cc0b413906b80962c3f467c26d1cc7303a51bd9fc482ab

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