Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49126b28cd076e6…

MALICIOUS

PDF

70.1 KB Created: 2021-06-03 14:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8521198fe0392d22abd47a29d7000780 SHA-1: 2543deb12f421769d27ea2780dcd32fa7b8d30c0 SHA-256: c49126b28cd076e676d332e742a23172288b356eb8ca17af2b69e32e03aa8cb1
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of a link farm, and is flagged for brand impersonation phishing, specifically targeting Amazon. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely lead to credential harvesting pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lepimezuraz.weebly.com/uploads/1/3/4/5/134599896/1e4f169b4d067.pdf.
  • 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://drafthe.ru/pbw?utm_term=possessive+apostrophe+quiz+ks1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479460/normal_60062fab1be57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fe3d614f2d71.pdfIn PDF document text
    • https://lepimezuraz.weebly.com/uploads/1/3/4/5/134599896/1e4f169b4d067.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/4e8a15db30a2e68.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/juvivumuzuwof.pdfIn PDF document text
    • https://matupazuru.weebly.com/uploads/1/3/2/6/132681479/judagasulodabajim.pdfIn PDF document text
    • https://felajarego.weebly.com/uploads/1/3/4/6/134605087/sofelojuzov-dixivatijil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_601e2cf0aa34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_60611608ecbf4.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/4388451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fadoposapat.pbworks.com/f/56737761128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7318bf9-6a49-490d-8354-7d377ec36188/kobalt_paint_sprayer.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/how_to_factory_reset_a_rca_galileo_pro_tablet.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144419406/25730869029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77692b2e-7522-4c42-a9af-1139cd7d6c75/how_to_lose_weight_well_rice_diet_plans_2019.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/41622464825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60548b76-4ce8-4430-ad46-af5229d4a628/bulopubudefaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f684b90-fce1-43fe-9705-9db8cd0e0dab/quotes_secret_admirer_dan_artinya.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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 5004 bytes
SHA-256: 0b4a0567817e5ae3bbaa160311bab11354858cf596992be2db4cbb94c7a384d3
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10208 bytes
SHA-256: 258bfa0b9bf581c33bb1811d584a38a098fb42efdaf29d4e267150fdd8ab1e13
font_02_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333