Malicious PDF — malware analysis report

Static analysis result for SHA-256 878266444c8a6962…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 05:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c510131032148d4711cf6cd29266720 SHA-1: a1fac0dfab17a7a56e9c83d1334bab0441dfc799 SHA-256: 878266444c8a6962cb63ec8b9e2157188193d87eeb67d5a0e5781c8c81a81547
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The embedded URI and link farm heuristics point to a phishing or scam attempt, directing users to potentially malicious domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://midufefew.ru/wix?keyword=bronx-lebanon+hospital+center+program+family+medicine+residency PDF link annotation
    • http://vobalemujumojak.mywebcommunity.org/bowobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_5ff2a812ae1ef.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/godurabak.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/35446566559.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ieJntCv/diamond_minecraft_seed_pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5fd7ea0eafa9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_603b0c8aac5ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/iikgjuF/63435455860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_60281bccd031a.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/8327562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_602d742ae4447.pdfIn PDF document text
    • https://sibozigoguxo.weebly.com/uploads/1/3/0/9/130969143/dopolofibak-tutijagejaveban-pajoxazotike-judagavunibado.pdfIn PDF document text
    • https://xugowapowafav.weebly.com/uploads/1/3/0/7/130775127/zunaweleluz-nikukegimif-vebirilono.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/8445550289.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/lokijuronig/grammar_worksheets_grade_2.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_c64ccd7c33374d3cbd42f4683ba954f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/panchatantra_stories.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_1d96177d8c5742d2b6f15ae43e0221f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/game_loop_app_for_android.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_e73072097b08425cb7cc7090033ada45.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_14935abbc9524538ba585c8ad0509484.pdf?index=trueIn 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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 5960 bytes
SHA-256: f8234cfc834c5bd3537a63ed01a395c6d62edfd6fe87036c8486343b056cf8a2
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 11248 bytes
SHA-256: 0977be7d387c3871e054ebe7d8a40e4139574f0750c64ef31124f0713a1a3739

Open this report in the interactive analyzer, or submit your own file for analysis.